A calf is an animal that is still very young and hasn't grown up yet. It's often a baby cow.
When we talk about calves, it usually refers to baby cows that are raised on farms for milk or meat. But sometimes you might hear someone say "calf" when referring to the lower part of a leg, especially in sports like football or rugby. That's because the calf muscles in your legs help you move and run.
How common is "calf"?
Word calf is considered uncommon in modern English. It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions
noun
A young cow or bull.
Leather made of the skin of the calf; especially, a fine, light-coloured leather used in bookbinding.
A young deer, elephant, seal, whale or giraffe (also used of some other animals).
A chunk of ice broken from a larger glacier, ice shelf, or iceberg.
A small island, near a larger island.
Example: the Calf of Man
A cabless railroad engine.
An awkward or silly boy or young man; any silly person; a dolt.