Meaning of “keep sb at arm's length” in the English Dictionary

british dictionary

"keep sb at arm's length" in British English

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keep sb at arm's length

C2 to not allow someone to become too friendly with you:

I always had the feeling she was keeping me at arm's length.

(Definition of “keep sb at arm's length” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)