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To remain in one's home, especially as an alternative to some social activity outside the house. My friends love hitting the bars on the weekend, but I'm so tired by the time Friday rolls around that I usually prefer to just stay in with a good book.
stay in (something)
to remain inside a place or thing; to stay indoors. Please stay in the house. It's too cold to go outside. You should stay in when it's this cold.
To remain at home and refrain from taking part in social activities: I stayed in last night and rented a movie.