twitch

Definitions

• A brief, small (sometimes involuntary) movement out of place and then back again; a spasm.
• (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.
• (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.