▲ dog days
☆ Watermelons sell fast during the dog days.
☆ I've wasted too much dog days.
It’s a scorcher!
☆ Let's cancel the appointment this evening; it's a scorcher outside!
☆ a scorcher of a free kick
☆ The novel is a scorcher.
☆ Those two are having a row, a scorcher.
▲ Indian summer
☆ We had a splendid Indian summer last October.
☆ As her illness worsened, my grandmother still enjoyed painting, so I think she had an Indian summer before her death.
▲ summer fling
☆ Our summer fling was over.
Full of hot air
▲ full of hot air
☆ What he said is full of hot air.
▲ full of nonsense
☆ You kids are full of nonsense.