- to live together as spouses without being legally married.
- to have illicit sexual relations.
- to live in a shack: He's shacked up in the mountains.
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Origin of shack1
Words nearby shack
British Dictionary definitions for shack up (1 of 3)
British Dictionary definitions for shack up (2 of 3)
Word Origin for shack
British Dictionary definitions for shack up (3 of 3)
Idioms and Phrases with shack up
Sleep together or live in sexual intimacy without being married. For example, They had been dating for two months and then decided to shack up. [Slang; first half of 1900s]
Stay or reside with, as in I'm shacking up with my cousin till I find a place of my own. [Slang; first half of 1900s]