coinˈer noun

1. A person who coins money
2. A maker of counterfeit coins
3. An inventor (of words, etc)

coinˈing noun

1. Minting
2. Invention

coin box noun

A telephone or other machine which one operates by putting coins in a slot

coinˈ-operated, coinˈopˈ or coin-in-the-slotˈ adjective

(of a machine) operated by inserting a coin in a slot

coin a phrase

To use a new phrase or expression (usu ironic, ie to repeat a cliché)

coin money or coin it

To make a lot of money rapidly

pay someone in his or her own coin

1. To give tit for tat
2. To give as good as one got

the other side of the coin

The alternative or contrasting viewpoint, argument, etc