Night-owl definition

A person who works at night or otherwise stays up late.
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A person who habitually stays up and is active late into the night.
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(idiomatic) One who stays up late at night or goes to bed late.

He's a night owl. He would rather stay up until 6am than wake up at that time.

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Other Word Forms

Noun

Singular:
night-owl
Plural:
night-owls