(1):

(n.) The act of flinching.

(2):

(v. i.) To withdraw from any suffering or undertaking, from pain or danger; to fail in doing or perserving; to show signs of yielding or of suffering; to shrink; to wince; as, one of the parties flinched from the combat.

(3):

(v. i.) To let the foot slip from a ball, when attempting to give a tight croquet.