dog day

noun

Definition of dog day

  1. 1a dog days plural :  the period between early July and early September when the hot sultry weather of summer usually occurs b :  a day in dog days :  a hot sultry day

  2. 2 dog days plural :  a period marked by dull lack of progress the dog days following any major upheaval

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Origin and Etymology of dog day

back-formation from dog days, translation of Late Latin dies caniculares, translation of Greek hēmerai kynades; from their being reckoned in ancient times from the heliacal rising of the Dog Star (Sirius)


First Known Use: 1538


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