put someone off their stroke
put (one) off (one's) stroke
To disturb, distract from, or interfere with what one is doing, such that they are unable to do it well. Having my parents watching while I worked on my painting really put me off my stroke. The boxer tried to put his opponent off his stroke by getting in his face right before the fight.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
put someone off their strokeBRITISH
If something puts you off your stroke, it stops you from concentrating on what you are doing, so that you do not do it as well as usual. A sudden sound from behind me put me off my stroke and I missed the ball completely. Compare with put someone off their stride. Note: The reference here is to rowing, in which all the members of a team have to pull on their oars at exactly the same moment. Each pull of the oars is called a stroke.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
put someone off their strokedisconcert someone so that they do not work or perform as well as they might; break the pattern or rhythm of someone's work.
Farlex Partner Idioms Dictionary © Farlex 2017