Longman Dictionary of Contemporary English - coin

~1 n 1 a piece of metal, usually flat and round, that is used as money  (- compare bill 1 (3), note1 (5)) 2 toss/flip a coin to choose or decide something by throwing a coin into the air and guessing which side of it will show when it falls  (Let's toss a coin to see who goes first.) 3 the other side of the coin a different or opposite way of thinking about something  (Children should learn to respect the police, but the other side of the coin is that the police should earn that respect.) 4 two sides of the same coin two problems or situations that are so closely connected that they are really just two parts of the same thing  (You can't cure poverty without also doing something about improving education; they're two sides of the same coin.) 5 money in the form of metal coins 6 pay sb back in their own coin BrE old-fashioned to treat someone in the same unpleasant way as they have treated you ~2 v 1 to invent a new word or expression, especially one that many people start to use  (The term `Information Highway' was coined a few years ago.) 2 to coin a phrase spoken used as a joke when you have just said something so familiar and ordinary that it is funny  ("Alone at last," he said, "to coin a phrase!") 3 coin money/coin it BrE spoken to earn a lot of money very quickly  (That new restaurant on the corner must be coining it.) 4 to make pieces of money from metal