impetuous and rash; hot-headed

hot seat

(obsolete) a machine that used draft horses as a source of power

The heated cathode of a thermionic valve

preheated air blown into a blast furnace

a cry of delight or enthusiasm

A container, normally of stainless steel, and sometimes portable, in which cooked food may be kept warm until being served; sometimes fitted with a bain marie

(obsolete) A hangover.

Alternative form of hot diggety dog

An internal combustion engine in which the fuel is ignited by hot, compressed gas rather than a spark