Wane
/wˈeɪn/
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Definition
(noun) A gradual diminution in power, value, intensity etc.
Sentence Examples
They say it's on the wane, but it's still got something, hasn't it?
Oh luck! Like the moon you change; steadily you wax and then wane again.
CEFR Practice Quiz
The manager noticed that the team's enthusiasm for the project began to ____ as the work became more difficult today.