moo

American  

[moo] / mu /

verb (used without object)

moos, present (3rd person singular) mooed, past participle, past mooing present participle

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

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noun

moos plural

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

Other Word Forms

Inflected Forms

Nouns

• moos
  plural

Participles

• mooing
  present
• mooed
  past

Conjugated Forms

Present

• moo
  simple
• moos
  simple
• have mooed
  perfect
• has mooed
  perfect
• am mooing
  progressive
• are mooing
  progressive
• is mooing
  progressive
• have been mooing
  perfect progressive
• has been mooing
  perfect progressive

Past

• mooed
  simple
• had mooed
  perfect
• was mooing
  progressive
• were mooing
  progressive
• had been mooing
  perfect progressive

Future

• will moo
  simple
• will have mooed
  perfect
• will be mooing
  progressive
• will have been mooing
  perfect progressive

Etymology

Origin of moo

First recorded in 1540–50; imitative

Example Sentences

Videos of the hippo went viral, memes were created, and visitor numbers at the zoo increased hugely as thousands flocked each weekend to catch a glimpse of Moo Deng.

From BBC • Apr. 8, 2026

“Tell everybody about the specialties,” the mayor said to Jessica and Marcos Moo, who smiled shyly as he started recording.

From The Wall Street Journal • Dec. 2, 2025

There’s nothing like your first time firing up “Mario Kart World” on a 4K TV and cruising through Moo Moo Meadows in a pack of two dozen goofy, hyperactive racers.

From The Wall Street Journal • Nov. 23, 2025

They are typically created to capitalise on social media trends or viral memes - such as for internet-famous pygmy hippo Moo Deng.

From BBC • Jul. 14, 2025

We heard a CLANG! and a startled Moo!

From "The Battle of the Labyrinth" by Rick Riordan