Where does “bolt” come from?

bolt (Middle English) comes from Old English bolt, from Old English -tūn, from Old English tūn, from Proto-West Germanic tūn, from Proto-Germanic tūną, from Gaulish dunum, from Proto-Celtic dūnom, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “bolt”, step by step

StepLanguageWordMeaning
1Old Englishboltbolt
2Old English-tūnhomestead, village, town
3Old Englishtūnenclosure, yard; place; dwelling
4Proto-West Germanictūnfence
5Proto-Germanictūnąfence; enclosure
6Gaulishdunumfort; hill, hillfort
7Proto-Celticdūnomstronghold, rampart
8Proto-Indo-Europeandʰewh₂-smoke; mist, haze

Words derived from “bolt

Every word from Proto-Indo-European dʰewh₂-Every word from Proto-Celtic dūnomEvery word from Gaulish dunum