Where does “bug” come from?

bug (Danish) comes from English Bug, from English bugge, from Middle English bugge, from Proto-Germanic bugja-, from Proto-Indo-European bʰew- — to grow, swell; to swell, wax, grow; to blow; to...

bug (Danish): belly; abdomen, abdominal cavity; belly, paunch

Definitions

  1. belly; abdomen, abdominal cavity; belly, paunch

Ancestry of “bug”, step by step

bug traces back through two separate lines of ancestry.

via English Bug

StepLanguageWordMeaning
1EnglishBugA Volkswagen Beetle car; A Bugatti car
2Englishbuggebeetle
3Middle Englishbuggebogy, hobgoblin, bugbear; scarecrow
4Proto-Germanicbugja-swollen up, thick
5Proto-Indo-Europeanbʰew-to grow, swell; to swell, wax, grow; to blow; to...

via Old Norse búkr

StepLanguageWordMeaning
1Old Norsebúkrtrunk
2Proto-Germanicbūkazbelly, abdomen; body
3Proto-Indo-Europeanbʰōw-to inflate, swell; to swell, grow, thrive, be,...

Words derived from “bug”

Every word from Proto-Indo-European bʰew- →Every word from Proto-Germanic bugja- →Every word from Middle English bugge →