IPA: /ˈbɜːrɡlər/
KK: /ˈbɜrɡlər/
A person who illegally enters a building with the intention of stealing something.
The burglar was caught trying to break into the house at night.
Burglar → It originates from the Old French word 'burglar', which is derived from 'burge' (meaning town or fortified place) and the suffix '-ar' (indicating a person who does something). A burglar is thus a person who comes from or operates in a town, specifically one who unlawfully enters a building to commit theft.
Think of someone who comes from a 'town' ('burge') to 'steal' — that's why a burglar is a person who unlawfully enters a place.