Meaning of “be playing at sth” in the English Dictionary

british dictionary

"be playing at sth" in British English

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be playing at sth

UK

If you ask what someone is playing at, you are angry because they are doing something stupid:

What on earth/the hell were you playing at? - You could have got us all killed!

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