waning

Adjective
  1. (of the Moon) pertaining to the period during which the visible surface of the moon decreases (synset 302545162)
    "after full moon comes the waning moon"
Noun
  1. A gradual decrease in magnitude or extent (synset 107437601)
    "the waning of his enthusiasm was obvious"; "the waxing and waning of the moon"
    is a type of: decrease, drop-off, lessening - a change downward

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