a brief, sudden, often involuntary movement of a muscle or body part

• a small, nervous jerk

to jerk or spasm briefly, often involuntarily

to pull or jerk something sharply and briefly

a brief, sharp pull or jerk

a handle with a loop used on a horse’s lip or ear to restrain it

a single, brief contraction of a skeletal muscle in response to one stimulus

to travel, often quickly, to see a rare bird

a trip made to observe a rare bird (birding jargon)

a sudden narrowing of a vein of ore