Wiktionary
check side
n. (context sports billiards snooker pool English) A sidespin of the cue ball which makes it bounce off the cush, or off another ball, at a shallower angle than normal.
Usage examples of "check side".
Squat and check shadows beside the hut, move, check window, move, check window, move, hesitate, step into alley between the huts with rifle at ready, hesitate three beats to check shadows in alley, move, squat and check side shadows, move.