IPA: /ˈhɛdz.mən/
KK: /ˈhɛdzˌmæn/
A person who carries out executions by beheading, often in a public setting.
The headsman stood ready to perform the execution in front of the gathered crowd.
Headsman → The word is formed from "head" (from Old English "heafod", meaning the upper part of the body or the leader) and "-sman" (a suffix denoting a person associated with a specific role). A headsman is a person who is responsible for executing someone, often by beheading, thus relating to the concept of being the one who takes the head.
Think of a 'headsman' as a person ('-sman') associated with the 'head' — this helps you remember that a headsman is someone who executes by beheading.