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twitch n a brief spasmodic contraction of muscle fibers also a slight jerk of a body part caused by such a contraction
twitch n QUACK GRASS
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(twich) 1. a brief contractile response of a skeletal muscle elicited by a single maximal volley of impulses in the motor neurons supplying it. 2. a noose passed around the lip or ear and through a perforation in a board, used for restraining a horse during minor surgery.Medical dictionary. 2011.