IPA: /ˈbeɪbiˌsɪtə/
KK: /ˈbeɪbiˌsɪtər/
A person who takes care of children when their parents are not around.
We hired a babysitter to look after the kids while we went out for dinner.
Babysitter → It is formed from "baby" (from Middle English *babe*, meaning an infant or very young child) and "sitter" (from Old English *sittan*, meaning to sit). The word "babysitter" refers to a person who sits with or cares for a baby or young child.
Think of someone who 'sits' with a 'baby' — that's why a babysitter is someone who takes care of a baby.