be as keen as mustard

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
Farlex Dictionary of Idioms.
See also:
  • keen
  • be mad keen
  • be mad keen (on someone or something)
  • keen as mustard
  • buzzkill
  • a buzz kill
  • close with
  • close with (someone or something)
  • sour on
  • sour on (someone or something)