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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 ?
Keener says it pays off for workers' comp administrators to think of new routes--such as investing in education and retraining for employees--to save money and get people back on the payrolls.
Keener warns parents, "Never leave your child in the care of someone who has not been trained in airway rescue.
The properties will be managed by Keener Management and Keener Construction will renovate the unit interiors, upgrade amenities, and perform light exterior upgrades.
Hard turns teach her the true nature of our life stories, though, in Rachel Keener's lovely, lilting bildungsroman, Pearl Weaver's Epic Apology.
David Walling (Hugh Laurie) and wife Paige (Catherine Keener) live on Orange Drive in New Jersey opposite best friends Terry and Cathy Ostroff (Oliver Platt, Allison Janney).
THE VERDICT Clive Owen and Catherine Keener are terrific as the parents who are shocked to find their 14-year-old daughter (the equally fine Liana Liberato) has been seduced online.
Keener said eggs can be more than 38[degrees]C (100[degrees]F) after washing and packaging in cartons.
With: Clive Owen, Catherine Keener. Liana Liberate, Jason Clarke, Noah Emmerick, Viola Davis, Chris Henry Coffey, Jay Siegel, Spencer Curnutt, Aislinn DeButch, Olivia Wickline.
Reilly, Jonah Hill, Marisa Tomei, Catherine Keener Plot: Seven years after his divorce, John (Reilly) is still smarting from being dumped by Jamie (Keener).
Starring: Logan Lerman, Brandon T Jackson, Alexandra Daddario, Jake Abel, Pierce Brosnan, Kevin McKidd, Sean Bean, Steve Coogan, Catherine Keener, Joe Pantoliano.
It all takes place among the wellheeled citizens of New York where Catherine Keener and hubby Oliver Platt run what you and I might call a second-hand furniture shop but in this side of the Big Apple it's known as dealing in vintage furnishings.
None was keener than Barbara Hocknell, 94, branch leader of Almondbury Mothers' Union, who was up at 5am in order to connect with her coach at 6.45am.
STARRING: Robert De Niro, Catherine Keener, Bruce Willis, John Turturro, Robin Wright Penn, Michael Wincott, Sean Penn, Kristen Stewart DIRECTOR: Barry Levinson CERTIFICATE: 15 RUNNING TIME: 102mins REVIEWER'S RATING: ** 1/2 SHOWING: Cineworld and Showcase VERDICT: The narrative is separated into slow-paced daily chapters, marking the progress of Fiercely from its disastrous test screening to the premiere at Cannes where Jeremy takes great delight in sticking two fingers up at Hollywood