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be as keen as mustard

To be very enthusiastic about something. Primarily heard in UK, Australia. These new kids are as keen as mustard to be in the choir, so we can definitely get them to clean up the choir room for us.
See also: keen, mustard

be keen about (someone or something)

To be excited about or interested in something. Rich is very keen about this cruise he's planned for the fall. Don't take this opportunity if you aren't keen about it.
See also: keen

be keen on (someone or something)

To be excited about or interested in someone or something. I'm glad that Jimmy and Lena are finally going on a date, since he's been keen on her for months. Don't take this opportunity if you aren't keen on it.
See also: keen, on

be mad keen (on someone or something)

To be very enthusiastic or excited about someone or something. Oh, I've seen the way Tim smiles at you—he's definitely mad keen on you! I'm mad keen on that college, so I really hope they accept me.
See also: keen, mad, someone

have a keen interest in (something)

To be very interested in or fascinated by something. John really has a keen interest in photography lately. I didn't realize that Amie had such a keen interest in painting until I saw some of her work—she's really talented!
See also: have, interest, keen

keen about (someone or something)

Especially excited about or interested in someone or something. I'm glad that Jimmy and Lena are finally going on a date, because he's been keen about her for months. Traveling to Tokyo last July made me really keen about learning Japanese.
See also: keen

keen as mustard

Very enthusiastic and excited (about or to do something). Hyphenated if used as a modifier before a noun. There are plenty of talented kids around this area who are keen as mustard to be on the team, so we should have no problem filling the spot. Silverstone plays the hardened veteran detective, while Ridley plays the keen-as-mustard rookie assigned to be her partner.
See also: keen, mustard

keen on (someone or something)

Especially excited about or interested in someone or something. I'm glad that Jimmy and Lena are finally going on a date, since he's been keen on her for months. Traveling to Tokyo last July made me really keen on learning Japanese.
See also: keen, on

peachy keen

Just fine; splendid; as good as one could hope for. Sometimes used sarcastically to imply the opposite. A: "Everyone doing all right in here?" B: "Yep, we're peachy keen!" A: "Oof, that was quite a tumble. You OK?" B: "Just peachy keen, thanks."
See also: keen, peachy

treat them mean, keep them keen

Neglecting a romantic partner (or a potential romantic partner) keeps them interested in you. A: "Why hasn't Tom called me yet? I thought he liked me." B: "Maybe he thinks that 'treat them mean, keep them keen' actually works."
See also: keen, keep, treat
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

have a keen interest in something

to have a strong interest in something; to be very interested in something. Tom had always had a keen interest in music, so he started a band. The children have a keen interest in having apet, so I bought them a cat.
See also: have, interest, keen

keen on doing something

willing or eager to do something. Dave isn't very keen on going to the opera. The children are keen on swimming this afternoon. Shall I take them?
See also: keen, on

keen on someone or something

 and keen about someone or something
to be enthusiastic about someone or something. I'm not too keen on going to Denver. Sally is fairly keen about getting a new job. Mary isn't keen on her new boss.
See also: keen, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

keen about, be

Be enthusiastic about. For example, He's been keen about this whole endeavor for a long time. It is also put as be keen on, which has the additional meaning "to be ardent about or in love with," as in Jim's been keen on Jane for years. With other adverbs, such as keen at and keen of, keen has been so used since the early 1500s; the current locutions, however, date from the mid-1800s.
See also: keen
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

keen as mustard

If someone is keen as mustard they are very eager to do something. I have an adult pupil who scored very low in assessments but is keen as mustard. Note: You can also describe someone as mustard-keen. Sir Richard was mustard-keen to say his bit. Note: `Keen' means enthusiastic, but is also used to mean sharp when referring to the blade or cutting edge of a tool or weapon. An acidic or sour taste can also be referred to as sharp, so enthusiasm is being likened to the sharp taste or `edge' given to food by mustard.
See also: keen, mustard
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

keen as mustard

extremely eager or enthusiastic. British informal
Keen is used here to mean ‘operating on the senses like a sharp instrument’.
See also: keen, mustard
Farlex Partner Idioms Dictionary © Farlex 2017

(as) ˌkeen as ˈmustard

(British English, informal) wanting very much to do well at something; enthusiastic: She’s as keen as mustard. She always gets here first in the morning and she’s the last to leave work in the evening.
See also: keen, mustard

be mad ˈkeen (on somebody/something)

(informal) be very interested in or enthusiastic about somebody/something: She’s been mad keen on African music ever since she came back from Zimbabwe last year.He’s mad keen on getting into the army.
See also: keen, mad
Farlex Partner Idioms Dictionary © Farlex 2017

peachy (keen)

mod. fine; excellent. Your idea is really peachy!
See also: keen, peachy
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in periodicals archive ?
He highlighted Bahrain's keenness for openness and constructive co-operation with the UN and its international agencies as well as protection of human rights at all national, regional and international levels.
Al-Haj Lura said in a press statement that he discussed with the President of the Republic the implementation of peace agreement that was signed between the parties in the Central African Republic, appreciating the keenness of Sudan to help solving all the African issues and to realize peace in Africa.
During a meeting titled "the Governing Council of the Inter-Parliamentary Union", MPAlan Bakr reiterated Syria's adherence to its independent decision, its sovereignty and keenness to determine its future without foreign interference, indicating that any supportive action taken by the IPU should be announced after an IPU delegation pays a visit to Syria to know what is taking place away the misleading media and political campaigns.
The move comes in line with the keenness of Shaikh Mohammed on the provision of the modern houses to the citizens to achieve family stability and ensure decent living conditions for them.
the Sultanate and the keenness to serve the interests of the countries.
Good Word Society board member and Award Marketing and Media Committee chairperson Samia Hussein stressed the importance of the prize which reflects keenness on keeping abreast of global developments in the field of voluntary work.
Mr Kuznetsov honoured His Majesty with the Academy's Grand Star Medal of First Class, which is one of the most prestigious scientific decorations, in recognition of the King's keenness to develop various fields of science and technology and his key role in boosting relations with Russia.
During his meeting Thursday at the Republican Palace with the visiting Ethiopian Deputy Prime Minister, Demeke Mekonnen, kibir has reiterated Sudan keenness to cement its relations with Ethiopia under the wise leadership in the two countries and to work for reactivating the joint cooperation committees, especially at the level of the joint economic committee and demarcation of the joint border.
He praised highly the efforts of the humanitarian coordinator and its keenness to support the water and environment sector in Yemen.
Download Berri reiterates keenness on sects' rights, 'not sectarianism'
MANAMA, May 3 (KUNA) -- Bahrain's Prime Minister Prince Khalifa Salman bin Hamad Al-Khalifa affirmed Wednesday the Kingdom's keenness On boosting economic cooperation and integration with Kuwait through increasing joint investments.
Cairo, Muharram 29, 1436, Nov 22, 2014, SPA -- Egyptian President Abdulfattah Al-Sisi stressed that Custodian of the Two Holy Mosques King Abdullah bin Abdulaziz Al Saud has a great role in achieving the Arab stability and reunification which reflects his keenness on the Arab and Islamic nations.
The 1-hour (from 4 p.m to 5 p.p) activity comes within the framework of ROH keenness to support its educational programs and the communication with the society.
He said: "We express our pride by the contributions of Shaikh Mohammed in the march of national work in the light of making the UAE achieve leadership in education, culture, health, housing and other infrastructure fields, in addition to his keenness on developing the country."