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dog day

noun

Definition of dog day

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

First Known Use of dog day

1538, in the meaning defined at sense 1a

History and Etymology for 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)

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