Shack up

v. i.	1.	to live together in a sexual relationship, without being legally married.
	2.	to live in a cabin, shack, or other crude dwelling.

Verb

1.

shack up - room or live together; usually said of people who are not married and live together as a couple Synonyms: cohabit

cohabit, domicile, domiciliate, dwell, inhabit, live, miscegenate, people, populate, reside, shack