A choke in sports happens when a player or team who is expected to win really messes up and loses a game or competition that they were supposed to win. It's like when you're playing a game of tag with your friends, and you're "it" and you're about to catch someone, but you trip and fall, so they get away from you. It's a big bummer when that happens, especially if you were about to win. In sports, it can be really embarrassing and disappointing because lots of people are watching and expecting you to do well. But it's okay – everyone makes mistakes sometimes, even very good athletes.