Where does “underhand” come from?

Underhand comes from English under combined with hand, where under derives from Old English under, Proto-Germanic under, and Proto-Indo-European n̥dʰér meaning below or underneath.

underhand (English): secret; clandestine; dishonest and sneaky; done...

Definitions

  1. secret; clandestine; dishonest and sneaky; done...

Ancestry of “underhand”, step by step

underhand traces back through two separate lines of ancestry.

via English Hand

StepLanguageWordMeaning
1EnglishHandThe part of the forelimb below the forearm or wrist in a human, and the corresponding part in many other animals
2Middle Englishhondhand; Alternative form of hound
3Old EnglishhandA hand
4Proto-West Germanichanduhand
5SwedishhandA hand; A hand; the set of cards held by a player
6Old SwedishhandA hand; A direction; A behalf
7Old Norsehǫndhand
8Proto-Germanichanduzhand

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 “underhand

Every word from Proto-Germanic handuz
underhand — Etymology, Origin & Word History | Etymology Explorer