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Related to waning: Waning moon
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1 : to grow smaller or less <His interest in the game was waning.
Consultant psychiatrist Dr Ian Pennell said: "She had a perception of a waning career and uncertainties about how she would support herself in the future.
Brenda Currin's memory aid for determining whether the Moon is waxing or waning (March issue, page 110) is similar to one I've used for years.
It states that "another important cause of the ground sinking is the waning of sediment deposition by the Mississippi River.