live-in
1 of 2adjective
ˈliv-ˌin 
1
: living in one's place of employment
a live-in caregiver
2
: being or involving people in a romantic or sexual relationship who live together and are not married
a live-in partner
a live-in relationship
live-in noun
plural live-ins
live in
2 of 2verb
lived in; living in; lives in
intransitive verb
: to live in one's place of employment : live in another's home
Word History
First Known Use
Adjective
1934, in the meaning defined at sense 1
Verb
1890, in the meaning defined above