# X's and O's

idiom

Source: https://englishreference.com/idiom/xs-and-os
Updated: 2026-08-10

## Meaning

The fundamental elements of a play.

## Examples

- The coach explains the X's and O's before the game starts.
- If you want to win this match, you need to stop worrying about the crowd and focus on the X's and O's of our strategy.
- While the fans cheered for the star athlete, the veteran coach remained focused on the complex X's and O's required to dismantle the opponent's defensive formation.

## Origin

The term derives from the established use of the letters X and O as conventional placeholders for various concepts. The characters function as arbitrary symbols for opposing or distinct categories within a system.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.