snake eyes

 

From the resemblance of the two single pips to the eyes of a snake.

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snake eyes pl (plural only)

1. (gambling, dice games, idiomatic) Two ones, after rolling two dice.

   Coordinate term: boxcars

   • 2021 June 29, Michael E. Mann, Susan Joy Hassol, “That Heat Dome? Yeah, It’s Climate Change.”, in The New York Times‎^[1], →ISSN:

     It’s as if snake eyes, which should occur randomly only once every 36 times you roll a pair of dice, were coming up once every four times.

2. (bowling, slang) A 7-10 split.

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•   snake eyes on Wikipedia.Wikipedia