put someone off their stride

put (one) off (one's) stride

To disturb, distract from, or interfere with what one is doing, such that they are unable to do it well. It really put me off my stride to have my parents watching while I worked on my painting. The boxer tried to put his opponent off his stride by getting in his face right before the fight.
See also: off, put, stride
Farlex Dictionary of Idioms.

put someone off their stride

BRITISH
If something puts you off your stride, it stops you from concentrating on what you are doing, so that you do not do it as well as usual. It was clearly a tactic designed to put his opponent off his stride. Note: The verbs knock and throw are sometimes used instead of put. Perhaps a few jokes during the game will knock Chris off his stride. Compare with put someone off their stroke.
See also: off, put, someone, stride
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • put (one) off (one's) stride
  • put one off one's stride
  • put one off stride
  • put somebody off their stride/stroke
  • put someone off their stroke
  • put (one) off (one's) stroke
  • stride for stride
  • drive (one) to distraction
  • drive someone to distraction
  • drive to distraction