Meaning of “knock/throw sb for a loop” in the English Dictionary

british dictionary

"knock/throw sb for a loop" in British English

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knock/throw sb for a loop

US informal

If something that happens knocks you for a loop, it upsets or confuses you because you do not expect it:

He knocked me for a loop when he said he was quitting his job.

(Definition of “knock/throw sb for a loop” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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