- The mature female of cattle of the genus Bos.
- The mature female of other large animals, such as whales, elephants, or moose.
- A domesticated bovine of either sex or any age.
- have a cow Slang To become amazed, angered, or upset: He had a cow when he saw the mess we made.
- till the cows come home Informal For a very long time; indefinitely: They could argue till the cows come home and still not reach an agreement.
- To frighten with threats or a show of force. See Synonyms at intimidate.