call it a day, to - to stop doing something
-chicken - afraid, scared
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coach potato, a - someome who likes to sit in comfort and do nothing
cock-and-bull story, a - an untrue story
come rain or shine - no matter how hard it is to do
copycat, a - a person who wants to do the same thing as other people 
cost an arm and a leg, to - to be very expensive
cough up, to - to pay money
cream someone, to - to totally beat someone in a game
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