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Region: US | Usage example: He is a few cards short of a deck when it comes to finances.

A few cards short of a deck

Meaning

Slightly lacking intelligence or common sense.

Usage

Used jokingly about someone acting foolishly.

Origin & History

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

Card game metaphor for missing elements.

Used since the mid-20th century in casual American slang.