shackup

[ shak-uhp ]
/ ˈʃækˌʌp /

noun Slang.

an instance of shacking up: The census people counted both marriages and shackups.

Origin of shackup

First recorded in 1945–50; noun use of verb phrase shack up
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019