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From The Collaborative International Dictionary of English v.0.48:
Jerk \Jerk\, n. [1913 Webster] 1. A short, sudden pull, thrust, push, twitch, jolt, shake, or similar motion. [1913 Webster] His jade gave him a jerk. --B. Jonson. [1913 Webster] 2. A sudden start or spring. [1913 Webster] Lobsters . . . swim backwards by jerks or springs. --Grew. [1913 Webster] 3. A foolish, stupid, or otherwise contemptible person. [Slang] Syn: jerkoff. [PJC] 4. (Sport) The lifting of a weight, in a single rapid motion, from shoulder height until the arms are outstretched above the head; distinguished from press in that the motion in a jerk is more rapid, and the body may be moved under the weight to assist completion of the movement; as, a clean and jerk of two hundred pounds. [PJC] 2. Calisthenic exercises, such as push-ups or deep knee bends; also called physical jerks. [British] [PJC]