"underfire : (transitive, intransitive) To heat from below. (transitive) To intentionally operate a..."

“underfire : (transitive, intransitive) To heat from below.
(transitive) To intentionally operate a boiler, furnace, oven, etc., at a low level.
(intransitive) Not burning fuel at the desired level, and thus not providing heat efficiently.
(transitive, ceramics) To fire at a low (or excessively low) temperature.”

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