Where does “sidearm” come from?

Sidearm comes from English side and arm, where side derives from Middle English side, Old English sīde, and Proto-Germanic sīdǭ, while arm derives from Latin arma meaning weapons, ultimately from Proto-Indo-European h₂er-.

sidearm (English): A personal weapon, such as a handgun or sword,...

Definitions

  1. A personal weapon, such as a handgun or sword,...

Ancestry of “sidearm”, step by step

sidearm traces back through two separate lines of ancestry.

via English Side

StepLanguageWordMeaning
1EnglishSideA bounding straight edge of a two-dimensional shape
2Middle Englishsidecustom
3Old Englishsīdeside, flank
4Proto-West Germanic*sīdāside
5Medieval Latinsida
6Late LatinsetaAlternative form of saeta; hair, bristle; bristle
7Latinsaetaa bristle, hair on an animal; silk
8Proto-Italicsaitā
9Proto-Indo-Europeanséh₂ito-
10Proto-Indo-Europeansh₂ey-to bind, fetter
11Proto-Indo-Europeanseh₂-to satiate, satisfy

via English Arm

StepLanguageWordMeaning
1EnglishArmAbbreviation of Armenian
2Middle Englisharmarm; poor; miserable, wretched
3Old Englishearmarm; poor, miserable
4Proto-West Germanicarmarm; poor, miserable; pitiful, pitiable
5Proto-Germanicarmazarm; poor, miserable; pitiful, pitiable
6Proto-Indo-Europeanh₂ermos
7Proto-Indo-Europeanh₂er-to fit, to fix, to put together

Words derived from “sidearm

Every word from Proto-Indo-European seh₂-Every word from Proto-Indo-European sh₂ey-Every word from Proto-Indo-European séh₂ito-