(be) shacked up with somebody
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shack up with somebody — ˌshack ˈup with sb | be ˌshacked ˈup with sb derived (slang) to start/be living with sb that you have a sexual relationship with, but that you are not married to • I hear he s shacked up with some woman. Main entry: ↑shackderived … Useful english dictionary
shack up — verb share living quarters; usually said of people who are not married and live together as a couple (Freq. 1) • Syn: ↑cohabit, ↑live together • Derivationally related forms: ↑cohabitation (for: ↑cohabit) … Useful english dictionary