knock/throw sb for a loop
US informalIf 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.
Thesaurus: synonyms and related words
Puzzle and confuse
- addle
- baffle
- bemuse
- bewilder
- blind sb with science idiom
- blur
- cloud
- do sb's head in idiom
- flummox
- fox
- fuddle
- mix
- mix sb up
- muddy
- muddy the waters idiom
- puzzle
- throw sb off balance idiom
- tie
- tie sb (up) in knots idiom
- unbalance
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You can also find related words, phrases, and synonyms in the topics:
Upsetting and destabilizing