Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: 'three-sided piece, corner', from Latin cuneus; CUNEIFORM

coin

1 noun
     
coin
coin1 S3 W3
1 [countable] a piece of metal, usually flat and round, that is used as money [↪ bill, note]
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:
Toss a coin to see who goes first.
3

the other/opposite side of the coin

a different or opposite way of thinking about something:
Making the rules is only part of it. How the rules are carried out is the other side of the coin.
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:
Great opportunity and great danger are two sides of the same coin.
5 [uncountable] money in the form of metal coins

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