moo

verb (used without object), mooed, moo·ing.

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

noun, plural moos.

2. a mooing sound.

verb

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

interjection

2. an instance or imitation of this sound

v.“to make the characteristic sound of a cow,” 1540s, of imitative origin. Related: Mooed; mooing. The noun is from 1789. Baby-talk moo-cow (n.) attested from 1812.