Longman Dictionary of Contemporary English homepage

coin

2 verb
     
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coin2 [transitive ]
1 to invent a new word or expression, especially one that many people start to use:
The word 'aromatherapy' was coined in the 1920s.
2

to coin a phrase

spoken said in a joking way when you use a very common expression, to show that you know it is used a lot:
He'd thought the flight would never - to coin a phrase - get off the ground.
3

coin money/coin it (in)

British English informal to earn a lot of money very quickly:
BT at its profitable peak was coining it at the rate of £90 a second.
4PEC to make pieces of money from metal
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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