There are 2 definitions of sleep in in English:

sleep in1

Remain asleep or in bed later than usual in the morning: life assumes a different rhythm on the weekend; we sleep in, cut the grass, wash the car
More example sentences
  • I was too tired to get up and go to school for 8 in the morning so I just slept in.
  • Sunday mornings are for sleeping in, not for physical exertion with the pub footie team.
  • Meanwhile, my sleeping in this morning meant Katharine had to get her own breakfast.
See parent entry: sleep

Definition of sleep in in:

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Word of the day epyllion
Pronunciation: ɪˈpɪlɪən
noun
a narrative poem resembling an epic in style...

There are 2 definitions of sleep in in English:

sleep-in2

Line breaks: sleep-in

adjective

[attributive]
(Of a domestic employee) resident in an employer’s house: a sleep-in babysitter
More example sentences
  • The former included a second carer for 6 hours a day in addition to 24-hour care by one carer, with sleep-in care for 10 hours.
  • A night awake carer would be paid for the full 10 hours overnight care whereas a sleep-in carer would be paid for 6 of those hours.
  • We are looking for a full time sleep-in domestic worker.

noun

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1An instance of remaining asleep or in bed longer than usual in the morning: a well-deserved sleep-in
More example sentences
  • I bet local residents thought they were going to get to sleep in this morning!
  • My bedroom is too hot to be able to sleep in!
  • That night, for the first time in months, I was able to sleep in.
2A form of protest in which the participants sleep overnight in premises which they have occupied: a student sleep-in began last night
More example sentences
  • An assessment was made of the sleep-in by some 60 students at the college the previous Thursday.
  • They were joined by students, who organized a sit-in and a sleep-in at the senate chambers in 2001.
  • Meanwhile, a New Yorker, after seeing the sleep-in on the national news, ordered the students two pepperoni pizzas and a cheese pizza from the pizza joint across the street.

Definition of sleep in in: