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A brief, small (sometimes involuntary) movement out of place and then back again; a spasm.
I saw a little twitch in the man's face, and knew he was lying.
(informal) Action of spotting or seeking out a bird, especially a rare one.
(farriery) A stick with a hole in one end through which passes a loop, which can be drawn tightly over the upper lip or an ear of a horse and twisted to keep the animal quiet during minor surgery.
1861, John Henry Walsh, The Horse in the Stable and in the Field:
THE TWITCH is a short stick of strong ash, about the size of a mopstick, with a hole pierced near the end, through which is passed a piece of strong but small cord, and tied in a loop large enough to admit the open hand freely.
(physiology) A brief, contractile response of a skeletal muscle elicited by a single maximal volley of impulses in the neurons supplying it.
(mining) The sudden narrowing almost to nothing of a vein of ore.
(birdwatching) A trip taken in order to observe a rare bird.