ˈrakiŋ noun
( -s )
Etymology: rack (IV) + -ing
1. : the setting back slightly of the end of each course of brick or stone as it is laid near the junction with another wall so that each course is shorter than the one below
2. : spun yarn or other seizing used in racking ropes
3. : the motion of a knitting machine that controls the needle position for dropping, transferring, or changing stitches