- To live together and have sexual relations without being married.
- To live, room, or stay at a place:
I'm shacking up with my cousin till I find a place of my own.
- to live or room (in a certain place)
- to live (with one's lover)
Other Word Forms of Shack
Origin of Shack
Probably back-formation from dialectal (chiefly southern United States) shackly rickety perhaps from English dialectal shackle to litter, disorder frequentative of shake
From American Heritage Dictionary of the English Language, 5th Edition
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