Topic: CURRENCIES
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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.
The word 'aromatherapy' was coined in the 1920s.2 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.
to coin a phrase
spokenHe'd thought the flight would never - to coin a phrase - get off the ground.3 to earn a lot of money very quickly : BT at its profitable peak was coining it at the rate of £90 a second.
coin money/coin it (in)
British English informalBT at its profitable peak was coining it at the rate of £90 a second.4PEC to make pieces of money from metal
