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Related to waning: Waning moon
References in classic literature ?
Once again, creeping chill through the flow of her young blood, she felt the slow and deadly prompting of despair which had come to her in the waning moonlight, which had whispered to her in the awful calm.
There was no evidence of heterologous virus genotypes contributing to changes in vaccine effectiveness over time, after accounting for this waning. In a mathematical model of mumps transmission, the central role of waning immunity to the vaccine was confirmed in the re-emergence of mumps cases.
When the moon is waning, or getting smaller, everything that grows into the ground - onions, potatoes, carrots - is planted.
1 : to grow smaller or less <His interest in the game was waning.> <The moon wanes.>