live in phrasal verb British English (see also live)
if someone lives in, they live in the place where they work ⇒ live-in:
Sometimes it can be easier if you have a nanny who lives in.

[TahlilGaran] Dictionary of Contemporary English ▲

live-in /ˈlɪv ɪn/ adjective [only before noun]

1. a live-in job is one in which you live with the family you work for:
a live-in nanny

2. live-in lover/boyfriend etc someone who lives with their sexual partner but is not married to them

[TahlilGaran] Dictionary of Contemporary English ▲

live in
live at the place where one works
The young woman got a job where she could live in with a family with three children.

[TahlilGaran] English Idioms Dictionary ▲

live in
v., informal To live in the school you attend or the place where you work.
Jack decided to live in during his freshman year at college.
Many women advertise for mother's helpers to room in with families and help take care of children.

[TahlilGaran] English Idioms Dictionary ▲