"wanes" in the noun sense
1. ebb, ebbing, wane
a gradual decline (in size or strength or power or number)
"wanes" 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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