IPA: /ˈlɒk.smɪθ/
KK: /ˈlɑkˌsmɪθ/
A person who creates, fixes, or works with locks.
The locksmith arrived quickly to help us get back into our house.
Locksmith → It is formed from "lock" (from Old English *locc*, meaning to fasten or secure) and "smith" (from Old English *smitan*, meaning to strike or work with metal). A locksmith is someone who works with locks, fastening and securing them, often by crafting them from metal.
Think of a person who 'works with metal' ('smith') to 'fasten' ('lock') things securely — that's what a locksmith does.