a piece of metal stamped and issued by the authority of a government for use as money.

a number of such pieces.

Informal . money; cash

He's got plenty of coin in the bank.

Architecture . quoin ( defs. 1, 2 ) .

Archaic . a corner cupboard of the 18th century.

operated by, or containing machines operated by, inserting a coin or coins into a slot

a coin laundry.

to make (coinage) by stamping metal

The mint is coining pennies.

to convert (metal) into coinage

The mint used to coin gold into dollars.

to make; invent; fabricate

to coin an expression.

Metalworking . to shape the surface of (metal) by squeezing between two dies. Compare emboss ( def. 3 ) .

British Informal . to counterfeit, esp. to make counterfeit money. ?

coin money

Informal . to make or gain money rapidly

Those who own stock in that restaurant chain are coining money.

pay someone back in his or her own coin, to reciprocate or behave toward in a like way

esp. inamicably; retaliate

If they persist in teasing you, pay them back in their own coin.

the other side of the coin, the other side, aspect

or point of view; alternative consideration.