n. phr. The two sides of a coin, especially when the coin is tossed in the air in order to decide which of two alternatives are to be followed. Tom tossed a quarter in the air and said, "Tails, I win; heads you win."
HEADS OR TAILS
Meaning of HEADS OR TAILS in English
American idioms English vocabulary. Английский словарь американских идиом. 2012