Mood Swing Definition

noun

An abrupt change in a person's mood, as from elation to sadness, esp. when caused by an underlying physiological or psychiatric condition.

Webster's New World

(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.

Wiktionary

Other Word Forms of Mood Swing

Singular:

mood swing

Plural:

mood swings

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