IPA: /ˈkræfts.mən/
KK: /ˈkræftsˌmæn/
A person, usually a man, who is skilled in making things by hand or in a particular trade.
The craftsman carefully carved the wooden statue with great attention to detail.
Craftsman is formed from "craft" (from Old English "cræft", meaning skill or art) and "-sman" (meaning a person who). A craftsman is a person skilled in a particular art or craft.
Think of someone who has a special 'skill' ('craft') and is a 'person' ('-sman') — that's what a craftsman is.