throw (one) for a loop

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throw (one) for a loop

1. To impact one with physical force, either intentionally or unintentionally, resulting in pain, disorientation, etc. He wasn't going very fast at all, but it still threw me for a loop when the cyclist ran into me.
2. To shock, surprise, astonish, or bewilder one. The end of that trick always throws the audience for a loop. I love watching their faces as they desperately try to figure it out. It really threw Stu for a loop when Olivia announced she was leaving the company.
See also: loop, throw

throw someone for a loop

or

knock someone for a loop

AMERICAN, INFORMAL
If someone or something throws you for a loop or knocks you for a loop, they shock you or surprise you very much. If Kravis's offer had thrown him for a loop, Johnson wasn't letting it show. She was wearing a top hat, the sight of which knocked Jamie for a loop.
See also: loop, throw

throw (or knock) someone for a loop

surprise or astonish someone; catch someone off guard. North American
See also: loop, throw

throw someone for a loop

tv. to confuse or surprise someone. Don’t let this question throw you for a loop.
See also: loop, throw