Region: General | Usage example: I called her bluff on the budget claim, and the numbers proved me right.

Call your bluff

Meaning

Challenge someone who is suspected of lying or exaggerating.

Used when demanding proof before accepting a bold statement.

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

From poker when an opponent is suspected of bluffing.

Became common in early 20th-century gambling circles and beyond.