night owl

Meaning

1. One who goes to bed late, or stays up late at night or in the early hours of the morning.
2. A musical instrument which imitates an owl's hoot, consisting of a receptacle partly filled with water and a mouthpiece that is blown into.
3. An owl (order Strigiformes) that is nocturnal.

Etymology / origin

From night + owl, from the fact that the bird is active at night.

Sources

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