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1. To sleep later than one is normally accustomed or allowed to, either by mistake or on purpose. My alarm didn't go off, and I ended up sleeping in by mistake! I'm taking the kids to the movies to let my wife sleep in this morning.
2. To sleep at one's place of employment at night. Hyphenated if used as a modifier before a noun. Staff of the hotel is be able to sleep in while working night shifts. We hired a sleep-in nanny to help us during the night time.
to oversleep; to sleep late in the morning. If you sleep in again, you'll get fired. I really felt like sleeping in this morning.
1. Sleep at one's place of employment, as in They have a butler and maid who both sleep in. [First half of 1800s]
2. Sleep late, either accidentally or deliberately. For example, I slept in and missed my usual train, or On weekends we like to sleep in. [Late 1800s]
1. To oversleep: I missed the morning train because I slept in.
2. To sleep late on purpose: After this week's work, I will sleep in on Saturday.
3. To sleep at one's place of employment: Their nanny sleeps in so she can take care of the children at night.