Where does “underbelly” come from?

Underbelly derives from English belly, which comes from Middle English under-, Old English bælg, Proto-Germanic *bhelǵʰ-, and ultimately Proto-Indo-European *bʰelǵʰ-, tracing back to the root *bʰel- meaning to swell.

underbelly (English): The underside of an animal; The underside of any...

Definitions

  1. The underside of an animal; The underside of any...

Ancestry of “underbelly”, step by step

underbelly traces back through two separate lines of ancestry.

via English belly

StepLanguageWordMeaning
1EnglishbellyThe abdomen, especially a fat one; The stomach;...
2Middle Englishbelybelly
3Old Englishbielġbag
4Proto-West Germanic*balgileather bag
5Proto-Germanicbalgizbag
6Proto-Indo-Europeanbʰelǵʰ-to swell
7Proto-Indo-Europeanbʰel-to sound; to speak, roar, bark; shiny, white; to...
8Proto-Indo-Europeanbʰōl-

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside

Words derived from “underbelly

Every word from Proto-Indo-European bʰōl-