be in the pocket

1. To be rhythmically complementary, as of jazz or funk musicians playing together. I can't help but dance to this record because those cats are really in the pocket. Don't go off on some weird, experimental solo, Tom. Because this is an ensemble piece, you need to be in the pocket. Their guitar player is a total square—he couldn't be in the pocket if he tried!

2. In fighting sports, especially boxing and mixed martial arts, to be within striking distance of one's opponent. He's got a devastating punch, so try not to be in the pocket for too long at any given time. Come on, man, if you're in the pocket like that, you're gonna get punched in the face—that's just how it is. Jones narrowly missed being knocked out while he was in the pocket there!