Where does “underarm” come from?

underarm (Norwegian Bokmål) comes from Norwegian Bokmål under, from Old Norse undir, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

underarm (Norwegian Bokmål): forearm

Definitions

  1. forearm

Ancestry of “underarm”, step by step

underarm traces back through two separate lines of ancestry.

via Norwegian Bokmål under

StepLanguageWordMeaning
1Norwegian Bokmålunderbelow; beneath; during; under
2Old Norseundirunder, underneath
3Proto-Germanicunderamong, between; under, beneath; under
4Proto-Indo-Europeanh₁entérbetween
5Proto-Indo-Europeanh₁enin; in, inside

via Norwegian Bokmål arm

StepLanguageWordMeaning
1Norwegian Bokmålarmpoor; an arm
2Old Norsearmrarm; poor, unhappy; wretched, wicked
3Proto-Germanicarmazarm; poor, miserable; pitiful, pitiable
4Proto-Indo-Europeanh₂ermos—
5Proto-Indo-Europeanh₂er-to fit, to fix, to put together
Every word from Proto-Indo-European h₁en →Every word from Proto-Indo-European h₁entér →Every word from Proto-Germanic under →