Meaning

noun a thrumming sound

verb sound with a monotonous hum

verb sound the strings of (a string instrument)

originFrom Middle English thrum, throm (> Anglo-French trome), from Old English *þrum (found in tungeþrum (“ligament of the tongue”)) from Proto-Germanic *þrumą. Cognate with German Trumm, Trümmer and Old Norse þrǫmr (“edge, brim”), and more distantly to Latin termen.

Etymology from Wiktionary, CC BY-SA 3.0