The idiom "not play with a full deck" likely originates from the world of card games, where a complete deck is necessary for fair and functional play. In this context, someone "not playing with a full deck" suggests a lack of mental completeness or sharpness, akin to a deck of cards missing some cards. The expression is used figuratively to describe individuals perceived as mentally challenged, irrational, or lacking common sense.

What is the origin of the idiom "not play with a full deck" and when to use it?

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to {not} [play] with a full deck

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Определение и значение слова «not play with a full deck» на английском языке

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