spasm

US /ˈspæz.əm/
UK /ˈspæz.əm/
"spasm" picture
1.

a sudden, involuntary muscular contraction or convulsive movement

:
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The sudden cold water caused a spasm in his leg.
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She experienced a painful muscle spasm in her back.
:
convulsioncramptwitchcontractionfit
2.

a sudden, brief spell of an activity or emotion

:
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He had a sudden spasm of anger.
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The market experienced a brief spasm of volatility.
:
burstoutburstfitboutrush