swelter

To suffer from oppressive heat.

To exude (venom, for example).

A condition of oppressive heat.

To faint with heat; be ready to perish with heat.

To perspire freely; sweat.

To oppress with heat.

To cause to exude like sweat, by or as if by heat.

[Sweltered venom is also explained as venom moistened with the animal’s sweat.]

To soak; steep.

To oppress with heat.