"wane" in the noun sense

1. ebb, ebbing, wane

a gradual decline (in size or strength or power or number)

"wane" in the verb sense

1. decline, go down, wane

grow smaller

"Interest in the project waned"

2. wane

become smaller

"Interest in his novels waned"

3. wane

decrease in phase

"the moon is waning"

Source: WordNet® (An amazing lexical database of English)

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