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old moon

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noun
  1. waning moon.
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Origin of old moon

First recorded in 1580–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for old moon

old moon

noun
  1. a phase of the moon lying between last quarter and new moon, when it appears as a waning crescent
  2. the moon when it appears as a waning crescent
  3. the time at which this occurs
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012