dog days
US /dɔɡ deɪz/
UK /dɔɡ deɪz/

1.
猛暑日, 真夏日
the hottest period of the year, usually considered to be from early July to early September
:
•
We usually go on vacation during the dog days of summer.
私たちは通常、夏の猛暑日に休暇に行きます。
•
It's too hot to do anything productive during these dog days.
この猛暑日には、生産的なことをするには暑すぎる。