Definition of dog day in English:

dog day

noun

  • 1In plural The hottest part of the summer, associated in ancient times with the heliacal rising of the Dog Star in the Mediterranean area, and formerly considered to be the most unhealthy period of the year and a time of ill omen.

  • 2A day in the dog days.

  • 3Figurative. In plural In early use: an evil time; a period in which malignant influences prevail. Now: a period of inactivity or decline.

Origin

Mid 16th century; earliest use found in Thomas Elyot (c1490–1546), humanist and diplomat. From dog + day, after post-classical Latin caniculares dies dog days, itself after Hellenistic Greek κυνάδες ἡμέραι.

Pronunciation

dog day

/ˈdɒɡ deɪ/