Meaning of “mean business” in the English Dictionary

american-english dictionary

"mean business" in British English

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mean business

informal

to want very much to achieve something

(Definition of “mean business” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mean business" in American English

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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.

(Definition of “mean business” from the Cambridge Academic Content Dictionary © Cambridge University Press)