(as) keen as mustard

idiom

Definition of (as) keen as mustard

British
: very excited and interested : very enthusiastic I gave him the job because he was willing to learn and seemed as keen as mustard.

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“(as) keen as mustard.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/%28as%29%20keen%20as%20mustard. Accessed 5 Aug. 2020.

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