moo

American  

[moo] / mu /

verb (used without object)

mooed, mooing

1. to utter the characteristic deep sound of a cow; low.

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noun

plural

moos

1. a mooing sound.

moo British  

/ muː /

verb

1. (intr) (of a cow, bull, etc) to make a characteristic deep long sound; low

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interjection

1. an instance or imitation of this sound

Etymology

Origin of moo

First recorded in 1540–50; imitative

Example Sentences

With the afternoon sun beating down while the cows snort and moo, the workers inspect and clean the animals' teats, which are then attached to milking equipment.

From BBC • Feb. 19, 2026

In addition to a “HYEWEST” vanity plate and longhorns on the front, there was a button inside that would make the car moo.

From Los Angeles Times • Mar. 18, 2025

“They moo a lot and poop a bit, but other than that, they’re pretty good workers,” Yancey says.

From Seattle Times • Aug. 18, 2023

Alsop took a painterly approach to Mahler’s many details — birdsong and bells, dewdrop harps, the lowing moo of a tuba.

From Washington Post • Feb. 20, 2023

“This doesn’t look like the moo goo gai pan I usually get. This looks spicy. You know I don’t like spicy food, Melissa.”

From "The Fourteenth Goldfish" by Jennifer L. Holm