IPA: /ˈɑːrmˌrɛst/
KK: /ˈɑrmˌrɛst/
A part of a chair or vehicle that provides support for your arm.
She rested her arm on the armrest while watching the movie.
Armrest → It is formed from "arm" (from Old English "earm", meaning the upper limb) and "rest" (from Old French "rester", meaning to remain or stay). The word "armrest" refers to a support for the arm, allowing it to remain in a comfortable position.
Think of a place where your 'arm' can 'rest' comfortably — that's what an armrest is for.