Definition of shack up with phrasal verb from the Oxford Advanced Learner's Dictionary

 

shack up with

 phrasal verb
phrasal verb
 
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Phrasal Verbs

shack up with somebody

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be shacked up with somebody

 
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(slang) to start/be living with somebody that you have a sexual relationship with, but that you are not married to I hear he's shacked up with some woman.
See the Oxford Advanced American Dictionary entry: shack up with