1The phase of the moon in its last quarter, before the new moon.
More example sentences
- 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.
Definition of old moon in:
- The US English dictionary