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Difference between Catch someone on the wrong foot and Put a foot wrong

catch someone on the wrong footsurprise a person when one is not ready or expecting smth.:

  • I’m afraid you rather caught me on the wrong foot, asking for it at such short notice.

put a foot wrong—(usually negat.) make the smallest mistake; make a blunder:

  • He complained that if he put a foot wrong, the manager was down on him at once.

See also: get off on the wrong foot / get out of bed with the wrong foot foremost.