Crossword Genius

Decrease in size, as the moon

Ross

I believe the answer is:

wane

(Other definitions for wane that I've seen before include "Anew (anag.)" , "Atrophy" , "Gradual decline, of the moon say" , "Grow smaller like the moon" , "Decrease, decline" .)

I've seen this clue in The New York Times.
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