Meaning of “be at a loss” in the English Dictionary

british dictionary

"be at a loss" in British English

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be at a loss

C2 not to know what to do or say:

I'm at a loss to know how I can help you.
It was unlike him to be at a loss for words.

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

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