Definition of as keen as mustard in English:

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(as) keen as mustard

British informal Extremely eager or enthusiastic.
Example sentences
  • He was keen as mustard to go and help, but we have been missing him and he's been missing us.
  • Being keen as mustard, we decided to walk from the station to the hotel.
  • Smith is just 21 and an emerging talent; bright-eyed, bushy-tailed, keen as mustard.
See parent entry: keen
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