IdiomBody & SensesEnglish

in one's birthday suit

Meaning: Completely naked.

Example: “The toddler escaped from the bath and ran through the party in his birthday suit.”

Origin: The joke is that you wear it on the day you were born. In the 18th century a "birthday suit" was a fine outfit worn to court on the monarch's birthday; the naked sense is recorded by the late 18th century.

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