[koin] 
| 1. | a piece of metal stamped and issued by the authority of a government for use as money. |
| 2. | a number of such pieces. |
| 3. | Informal. money; cash: He's got plenty of coin in the bank. |
| 4. | Architecture. quoin (defs. 1, 2). |
| 5. | Archaic. a corner cupboard of the 18th century. |
| 6. | operated by, or containing machines operated by, inserting a coin or coins into a slot: a coin laundry. |
| 7. | to make (coinage) by stamping metal: The mint is coining pennies. |
| 8. | to convert (metal) into coinage: The mint used to coin gold into dollars. |
| 9. | to make; invent; fabricate: to coin an expression. |
| 10. | Metalworking. to shape the surface of (metal) by squeezing between two dies. Compare emboss (def. 3). |
| 11. | British Informal. to counterfeit, esp. to make counterfeit money. |
| 12. | coin money, Informal. to make or gain money rapidly: Those who own stock in that restaurant chain are coining money. |
| 13. | 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. |
| 14. | the other side of the coin, the other side, aspect, or point of view; alternative consideration. |
coin
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coin money
Also, mint money. Make a great deal of money easily or very quickly. For example, With a monopoly on the market he could coin money, or These highly motivated realtors just about enable the agency to mint money. This hyperbolic expression dates from the mid-1800s.