\ ˈman-ˌchī(-ə)ld \
plural men-children\ ˈmen-​ˌchil-​drən , -​dərn \

Definition of man-child

1 : a male child : son … it came to her what a glory it would be to be the mother of a man-child like this.— Jack London
2 : a man who has the qualities of a child : a childlike man … a largely likable tale about a 38-year-old man-child trying finally to grow up.— Manohla Dargis

First Known Use of man-child

14th century, in the meaning defined at sense 1

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The first known use of man-child was in the 14th century

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