
Set up house
Life Stage
Often used when people start living independently, marry, or want to create a family atmosphere.

My sister plans to set up house once she finishes college.
Commitment Implication
Implies a significant step and long-term commitment to a living space, not just temporary accommodation.

They didn't just rent a place, they decided to set up house and invest in furniture.
Cohabitation
May suggest that two or more people are moving in together to share a home.

After a year of dating, the couple is excited to set up house together.
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