Mean business

[Rita]

Test No. incompl/inter-53 "Business Expressions (2)", question 4

I really wouldn't joke about it because these people are deadly serious and ......... business.

(a) signify
(b) mean
(c) require
(d) need

Test No. incompl/inter-53 "Business Expressions (2)", answer 4

I really wouldn't joke about it because these people are deadly serious and mean business.

Correct answer: (b) mean

Your answer was: incorrect
I really wouldn't joke about it because these people are deadly serious and need business.
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Sorry! I don't understant the expression
mean business
Thank you teachers
Rita

[Alan]

They are serious in their intentions.
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English as a Second Language
You can read my ESL story Present Simple

[Tuanvukt]

The "mean business" is idiom and means " to be serious about achieving somthing"