n A soft mass of material stuffed into a cloth bag, used for comfort or support; for sitting on, kneeling on, resting one's head on etc.
n Something acting as a cushion, especially to absorb a shock or impact.
n (context|sports|billiards|snooker|pool) The lip around a table in cue sports which absorbs some of the impact of the billiard balls and bounces them back.
n (figuratively) a sufficient quantity of an intangible object (like points or minutes) to allow for some of those points, for example, to be lost without hurting one's chances for successfully completing an objcetive.