Meaning of “your marbles” in the English Dictionary

british dictionary

"your marbles" in British English

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your marbles

informal humorous your mental health or your ability to think and remember clearly:

I think he's losing his marbles (= starting to forget things or become crazy).
She's 89, but she's still got all her marbles.

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