dog day


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

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

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

Seen and Heard

What made you want to look up dog day? Please tell us where you read or heard it (including the quote, if possible).


a trip made at another's expense

Get Word of the Day daily email!