Meaning

noun a fastener that is inserted into holes in two adjacent pieces and holds them together

originFrom Middle English dowle, dule, of uncertain origin. Perhaps from Old French doelle (“the hollow part of a tool where the handle is”), from Frankish *duli (“hollow tube, pipe”), from Proto-Germanic *dulją (“pipe”), from Proto-Indo-European *dʰel- (“curvature, hollow”). If so, then cognate with French douelle, douille. Alternatively from Middle Low German dövel (“peg, plug”), from Old Saxon…

Etymology from Wiktionary, CC BY-SA 3.0