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sleep over (with someone) (some place)
to spend the night sleeping at someone else's home. (Typically said by teenagers or younger children who spend the night with a friend.) Mom, can I sleep over with Tony? Can I sleep over at Tony's house?
Spend the night as a guest in another's home, as in Karen's friend Wilma is going to sleep over tonight. [Second half of 1800s]
To spend the night as a guest in another's home: A friend from out of town slept over last night. You can sleep over on the couch if you're too tired to drive home.