moo

American

[moo] / mu /

verb (used without object)

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

noun

a mooing sound.

moo British

/ muː /

verb

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

interjection

an instance or imitation of this sound

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Inflected Forms

noun

moos

plural

Conjugated Forms

Present

Past

Future

Etymology

Origin of moo

First recorded in 1540–50; imitative

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

I pulled out the garbage can from under the sink and started pitching—lettuce, both rusted and soggy; fourteen-day-old moo shu pork that looked deceptively edible; and peaches with skin like a mummy’s.

From "The Line Tender" by Kate Allen

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023