Meaning of “be big of sb” in the English Dictionary

british dictionary

"be big of sb" in British English

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be big of sb

informal disapproving

If an action is big of someone, it is kind, good, or helpful. This phrase is usually used humorously or angrily to mean the opposite:

You can spare me an hour next week? That's really big of you!

(Definition of “be big of sb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)