to shack up

listen to the pronunciation of to shack up
English - English
To live together, especially of an unmarried couple

I don't think his father was too thrilled when he shacked up with his girlfriend.

(bad language) Live together before you get married, live common-law
{i} live together without being legally married (Slang)
room or live together; usually said of people who are not married and live together as a couple
to shack up
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