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English definition of “shack up”

shack up

informal phrasal verb with shack     /ʃæk/ verb
to start living in the same house as sexual partners , without being married : I hear Tony and Helen have shacked up together. She's decided to shack up with her boyfriend .Marriage, cohabitation and other relationships
(Definition of shack up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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