IPA: /ˈɑːrɡɑːrd/
KK: /ˈɑrmˌɡɑrd/
A protective item worn on the arm or wrist to keep it safe during activities like archery or fencing.
The archer wore an armguard to protect his arm from the bowstring.
Armguard → It is formed from "arm" (from Old English "earm", meaning the upper limb) and "guard" (from Old French "garde", meaning to protect or watch over). The word "armguard" refers to a protective covering for the arm.
Think of protecting your 'arm' with a 'guard' — that's why an armguard is a protective covering for your arm.