They swung southwards, parallel to the river, and the heat of the day started to build up.

The heat then started on Iran because its leader dared speak up.

The dark clouds were sweeping in from the north, and the heat of the sun was starting to fade.

The heat, which had started out intense, was starting to build, baking her face and hands.

The heat was starting to drive him back.

By 1991, though, the heat was already starting to fade.

The heat can start combustion of the hydrogen gas, which will result in an explosion.

The heat was starting to get to him, he reflected.

I felt chilly for a moment until the heat of anger started warming me, said nothing.

Any longer and the heat starts to dissipate one's concentration.