Man child

noun, slang

Definitions

Noun
  1. 1
    An adult male who is childish or immature. derogatory, informal

    "In the end, Brown said he just couldn't stand another day of trying to run a team with two sets of rules — one for 11 players and the other for the man-child superstar."

  2. 2
    A young male human; a boy. archaic

    "Bring forth Men-Children onely: / For thy vndaunted Mettle ſhould compoſe / Nothing but Males."

Etymology

From Middle English manchylde, man-chylde (“a male child”), equivalent to man + child.

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