DictionaryspasmMuscle contraction
noun

spasm

SPAZ-uhm/ˈspæzəm/

A sudden brief muscular contraction.

A sudden spasm in my calf makes me stop walking.

A runner stops and grips a cramped calf, winces mildly; clothed and anatomically realistic.
Etymology

Greek spasmos named a convulsion and came from a verb meaning “draw,” “pull,” or “contract violently.” The connection is a muscle's sudden involuntary pulling tight.

In context

Cleveland Clinic0:23
it can cause an involuntary muscle spasm. This quick jerk motion pulls air in and snaps your vocal cords shut leading to the familiar hiccuping sound.
What Causes Hiccups?

More examples

  • She felt a brief spasm in her eyelid.
  • The doctor prescribed medicine to reduce his muscle spasms.
  • My back went into spasm when I lifted the box.

Forms

spasm · spasms

spasmodic adjective — Involving sudden, involuntary contractions of muscles.

Similar words

cramp
Usually a painful, sustained contraction rather than a brief tightening.
twitch
A small, quick muscle movement, often visible beneath the skin.