1coin 
/ˈkoɪn/ noun
plural coins /ˈkoɪn/ noun [count] : a small, flat, and usually round piece of metal issued by a government as money
▪ gold/silver/copper coins ▪ I have a dollar in coins.
▪ gold/silver/copper coins ▪ I have a dollar in coins.
the other/opposite/flip side of the coin
: a different way of looking at or thinking about a situation
▪ The economy is improving, but the other side of the coin is that inflation is becoming a bigger problem.
▪ The economy is improving, but the other side of the coin is that inflation is becoming a bigger problem.
toss/flip a coin
: to decide something by throwing a coin up in the air and seeing which side is shown after it lands
▪ Let's toss a coin. Heads, we don't go; tails, we do.
▪ Let's toss a coin. Heads, we don't go; tails, we do.
two sides of the same coin
: two things that are regarded as two parts of the same thing
▪ These problems may seem unrelated but they are really two sides of the same coin.
▪ These problems may seem unrelated but they are really two sides of the same coin.
