＜Great Heat＞-the hottest day.
It was very hot and muggy.
＜Slight and great heat without a gentleman＞, because the weather was hot and got bad temper.

Many people couldn't bear and take off their clothing.
They lost manner and virtue.
So it called＜great heat＞.

It was the hottest weather.
The hot sun was high in the sky.
A boy of "great heat"carried a sun to irradiate earth.
A proverb-＜A hot day in June＞.