(as) keen as mustard
01
used to refer to a person with a very high level of enthusiasm
Dialect
British
British
Approving
Idiom
Informal
例
I've never seen anyone as keen as mustard about hiking as Jane. She plans every trip meticulously and ca n't wait to hit the trails.
Sarah is always the first one to volunteer for any project at work. She's as keen as mustard and brings so much enthusiasm to the team.
