Why was "tantrum" trending last week?
King Arthur's sword, c.1300, from Old French Escalibor, corruption of Caliburn, in Geoffrey of Monmouth (c.1140) Caliburnus, apparently from Welsh Caledvwlch probably a variant of the legendary Irish sword name Caladbolg which may be literally "hard-belly," i.e. "voracious." For first element, see callus; for second, see belly (n.).
The sword of King Arthur. In one version of the legends of Arthur, he proved his right to rule by pulling Excalibur out of a stone. In another version, he received Excalibur from a maiden, the Lady of the Lake, to whom he returned it at the end of his life.