| noun | a gradual decline (in size or strength or power or number) |
| verb | grow smaller “Interest in the project waned” |
| verb | become smaller “Interest in his novels waned” |
| verb | decrease in phase “the moon is waning” |
| ebb | verb | fall away or decline |
| wane | verb | grow smaller |
| decline | noun | change toward something smaller or lower |
| wane | noun | a gradual decline (in size or strength or power or number) |
| waning | noun | a gradual decrease in magnitude or extent |