[English Etymology] *ar- "arm, upper limb, to fit together" 💪 ⚔ 🔩

 *ar- "arm, upper limb, to fit together"   💪 ⚔ 🔩


Eng arm "upper limb of the human body"
       Old English earm, 
           Proto-Germanic *armaz


Eng arm "weapon"
        Old French armes "arms, weapons; war, warfare"
                       Latin arma "weapons (including armor), "tools of war"
                             PIE *ar(ə)mo-,


 Old French harmonie, armonie "harmony, the musical instrument (12c.)"
               Latin harmonia 
                    Greek harmonia "agreement, concord of sounds, means of joining ship-planks etc.; settled government, order," 
                                   harmos "fastenings of a door; joint, shoulder"