Mood-swing definition

An abrupt change in a person's mood, as from elation to sadness, esp. when caused by an underlying physiological or psychiatric condition.
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(psychology) A rapid and extreme changing in mood, from excessively happy to desperately miserable.

The worst thing about my wife's pregnancy was her awful mood swings.

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Other Word Forms

Noun

Singular:
mood-swing
Plural:
mood swings