odd or even

Also odd and even
Or odds or evens

noun

1. any of various games of chance in which one bets on an odd or even number, as one in which two players alternately draw from a pile of an odd number of counters any desired number up to a prearranged limit, the object being to have drawn an odd number of counters at the end of the game.

Word History and Origins

Origin of odd or even¹

First recorded in 1625–35