Definition of man in the moon in US English:

man in the moon

noun

  • 1An imagined semblance of a man (or a man's face) in the disc of the (full) moon; (hence) the mythical person suggested by this semblance, supposed to dwell in the moon.

  • 2"no more than the man in the moon" and variants: no more than anyone, not at all.

Origin

Middle English. From man + in + the + moon. Inhabitants of the moon were postulated in ancient Greek and Hellenistic Greek texts; for closer analogies to the English phrase, compare German der Mann im Mond, French le visage de la lune, Dutch het mannetje in de maan, and post-classical Latin rusticus in luna; an early and influential attestation of the last from a British source is.

Pronunciation

man in the moon

/ˌman ɪn ðə ˈmuːn/