Definition of old moon in English:

old moon

noun

  • 1The phase of the moon in its last quarter, before the new moon.

    • ‘We'd be old friends looking at an old moon, against the backdrop of lit-up Chicago.’
    • ‘There is a slice of new, or old moon in the sky to the east, with Mars still glowing orange in the west.’
    • ‘For those of you who saw that big old moon in the sky last night, with its full face aglow, you will understand.’
    1. 1.1mass noun The time when the old moon occurs.