IPA: /ˈdʒeɪlər/
KK: /ˈdʒeɪlər/
A person whose job is to take care of a jail and the people in it.
The jailer checked the cells every hour to ensure the inmates were safe.
**Jailer** → It is formed from "jail" (from Old French *jaiole*, meaning a cage or prison) and "-er" (meaning a person who). A jailer is a person who works in a jail or prison, overseeing inmates.
Think of a person who works in a 'cage' ('jaiole') — that's why a jailer is someone who oversees a prison.