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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 ?
The popularity of e-readers in this age group is related to the fact that the digital book is designed specifically to cater for an activity in which they are the keenest participants, he said.
The bill was proposed to the Keenest by Likud Coalition Chairman Ze'ev Elkin (a settler) to encourage building settlements in the West Bank.
Eurogse strives to offer the best level of service at the keenest cost while maintaining the same or even higher levels of quality for ground support.
A league table of who's greenest, who's keenest and who's lagging behind: that's one possible outcome of a new project to help towns and cities across the Northwest improve their performance when it comes to tree cover in urban areas.
THE Army Angling Federation, for serving and ex-service personnel is one of the keenest outfits in the game.
"Paul has one of the keenest marketing minds in our industry, and he also brings a terrific background in all sides of sales and sales leadership," said Mary Junck, chairman and CEO of Lee, in a statement.
"I remember her in the 1970s as one of the club's keenest debaters."
Capita director John Roundhill says small investors were keenest to buy into financials, the largest sector in FTSE 350, during August/September.
May I thank you for the beauty and truth of "The Waves." To read it gives me the keenest joy, and I am filled with exultation that such a lovely thing should be.
Let's say that we can identify our 2,000 keenest customers and devise some way of charging them the 9 [pounds sterling] per unit that they're prepared to pay while holding the other 8,000 units at 5 [pounds sterling].
The EIB's French Hospitals programme will enable them to obtain the keenest maturity and interest rate terms.
Schrag's keenest insight is that any individual court decision is merely a way station on a cycle of litigation, legislation, and litigation yet again.
But even the keenest eyes won't find mention of September 11 relief efforts on the web site of the Animal Friendly License Plate Association, a nonprofit agency in Kansas City, Mo.
But due to the nature of competition and their drive for excellence, the profiled practices have been implemented and honed to help place their practitioners as the most admired, the most profitable and the keenest competitors in the business."
And yes, I wanted deeply to believe, as Hoffman had, that rock music harbored some profound revolutionary potential, that youth culture represented something more than the demographic advertisers are keenest to reach.