be on the wane

be on the wane

To be decreasing or lessening. Thank goodness this storm is finally on the wane—I can't tolerate another day of rain.
See also: on, wane

be on the ˈwane

(written) be becoming smaller or less strong: Their political power is on the wane.
When the moon is on the wane it appears smaller in the sky.
See also: on, wane
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