(informal) A nervous condition which prevents a sportsman from playing properly; especially a condition which causes a golfer to miss an easy putt, or a tennis player to serve a double fault.
2013, William Fotheringham, The Guardian, Monday 13 May 2013:Defining precisely why a professional cyclist might lose his touch on descents is as difficult as explaining a golfer's yips or a striker's sudden inability to find the net. It happens rarely, most famously in the early 1990s; the double world champion Gianni Bugno suffered from it and only rediscovered his "flow" after being made to listen to Mozart to calm his nerves.