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English definition of “(as) keen as mustard”

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(as) keen as mustard

UK old-fashioned
very eager and interested in everything
Translations of “(as) keen as mustard”
in Chinese (Traditional) 極為熱切, 極感興趣…
in Chinese (Simplified) 极为热切, 极感兴趣…
(Definition of (as) keen as mustard from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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