heads or tails
idiomPart oftail
heads or tails — idiom
1. used when asking which side of a coin will face upward after it is tossed, as a
1.idiom
Definition
used when asking which side of a coin will face upward after it is tossed, as a way of deciding something by chance
Example
Zuri asked, "Heads or tails?" before flipping the coin to decide who would go first.
They settled the argument with a quick game of heads or tails.