Birthday suit

noun

Definitions

Noun
  1. 1
    Nakedness, unclothed skin; an exposure of a human's natural anatomy without clothing. humorous, idiomatic, often

    "George embarrassed his aunt by answering the door in his birthday suit."

  2. 2
    informal terms for nakedness wordnet
  3. 3
    Used other than figuratively or idiomatically: see birthday, suit.

Etymology

From the lack of clothes worn when one is born.

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