keen

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treat them mean, keep them keen

Neglecting a romantic partner (or a potential romantic partner) keeps him or her 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

be as keen as mustard

To be very enthusiastic about something. 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

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

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

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

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

keen as mustard

mainly BRITISH, OLD-FASHIONED
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

peachy (keen)

mod. fine; excellent. Your idea is really peachy!
See also: keen, peachy