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odd or even

or odds or evens

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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.
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Also odd and even.

Origin of odd or even

First recorded in 1625–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018