Definition of “use your head” - English Dictionary

british dictionary

“use your head” in British English

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use your head

UK old-fashioned informal use your loaf

used to tell someone in a slightly angry way to think more carefully about what they are doing:

Why didn't you use your head and cover the furniture before you started painting?

(Definition of “use your head” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)