Question 1

What does "shack up" mean?

Accepted Answer

To begin living with a romantic partner without being married.

Question 2

How do you use "shack up" in a sentence?

Accepted Answer

After dating for two years, they decided to shack up together in a flat near the park.

Question 3

Is "shack up" formal or informal?

Accepted Answer

"shack up" is informal — used mainly in casual conversation. Can carry a mildly disapproving or humorous tone, depending on the speaker's generation and attitudes. In some older or more conservative usage it implies moral judgment. Today it is often used neutrally or humorously. 'Shack up with someone' is the typical form.

shack up

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