mean business - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “mean business”

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mean business

to be serious about taking action: You’ve got to tell the students that you mean business – if they don’t do work, they won’t pass the class.
Translations of “mean business”
in Chinese (Traditional) 是認真的, 決心要做成(某事)…
in Chinese (Simplified) 是认真的, 决心要做成(某事)…
(Definition of mean business from the Cambridge Academic Content Dictionary © Cambridge University Press)
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