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noun
a gradual decrease in magnitude or extent
"the waning of his enthusiasm was obvious"
"the waxing and waning of the moon"
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(of the Moon) pertaining to the period during which the visible surface of the moon decreases
"after full moon comes the waning moon"
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linger
remain present although waning or gradually dying
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darkening
becoming dark or darker as from waning light or clouding over