What's a "Swim move"?

[ChuckElias]

The swim stroke describes the motion an offensive player in the post uses to move the defender's arm out of his way.

Picture the offensive man on the block. The defender is to his side, but is holding an arm up in front of the offensive player, trying to deny the pass into the block. The offensive player can't get a good passing lane, so he raises his arm and brings it back down over the defender's arm. This swimming motion removes the defender's ability to deny the pass.

Chuck