on a/the toss of a/the coin

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on a/the toss of a/the coin

1. Literally, based on the outcome of a coin toss (i.e., the 50% chance that it will be either heads or tails). The team who starts off with the ball is always decided on the toss of a coin. We both wanted the last slice of pizza, so we're letting the outcome be determined on a toss of a coin.
2. By extension, purely at random; relying entirely on chance. New restaurants come and go in this area, their fates essentially decided on the toss of a coin. The economy is such an unpredictable beast that it seems to change on a toss of a coin.
See also: coin, of, on, toss
References in periodicals archive ?
They beat Barnard Castle, Kings Tynemouth and Giggleswick in their pool matches then drew with Connacht Schools and went through on the toss of the coin to play Queen Elizabeth GS, Wakefield, in the semi-final, winning 6-3.