A blue moon isn’t really blue, but it refers to the rare occurrence of two full moons in a single month. 
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The saying raining cats and dogs has an interesting origin. It dates back to the 17th century, when poor drainage systems would flood streets, sometimes with dead animals like cats and dogs.  #FascinatingLanguage, #WordOrigins, #DownpourSayings, #RainyDaySayings, #LearningThroughWords