verb

flare

to blaze, to burn brightly, to widen, to break out

The small fire suddenly flared.

The small fire suddenly flared.

His nostrils flared in anger.

His nostrils flared in anger.

Tempers flared during the debate.

Tempers flared during the debate.

((no object)) to burn brightly and suddenly The small fire suddenly flared.

((up)) to suddenly become active or violent Tempers flared up during the debate.

Synonyms: blaze, burn, erupt; Antonyms: dim, fade

Origin uncertain, but likely related to flame and the idea of a sudden burst of light.

Think of a camera lens flare, a sudden burst of light that spreads out.

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