underfire

Etymology
From.

Verb

 * 1)  To heat from below.
 * 2)  To intentionally operate a boiler, furnace, oven, etc., at a low level.
 * 3)  To burn fuel at less than the desired level, thus not providing heat efficiently.
 * 4)  To fire at a low (or excessively low) temperature.
 * 1)  To burn fuel at less than the desired level, thus not providing heat efficiently.
 * 2)  To fire at a low (or excessively low) temperature.
 * 1)  To burn fuel at less than the desired level, thus not providing heat efficiently.
 * 2)  To fire at a low (or excessively low) temperature.
 * 1)  To fire at a low (or excessively low) temperature.
 * 1)  To fire at a low (or excessively low) temperature.