From Longman Dictionary of Contemporary Englishlie in phrasal verb British EnglishSLEEPto remain in bed in the morning for longer than usual → lie-in → lie→ See Verb tablelie-inˈlie-in noun [singular] British EnglishSLEEP an occasion when you stay in bed longer than usual in the morning I always have a lie-in on a Sunday.
Examples from the Corpus
lie-in• I am a nurse working shifts and enjoyed, and needed, early nights and morning lie-ins.• The family had a lie-in on Saturdays.• On Sunday mornings, she had a lie-in, seldom rising before ten o'clock.• It is 0320 before the team finally get to bed, with the Captain promising them a lie-in until 1000 hours.• The enforced lie-in was welcome; we caught the tide and enjoyed a short, rough crossing to Taransay.• Juliet had been glad of her lie-in, but it would have been nice to be here with him.• Had a splendid lie-in till about 10am - finishing one of Jilly Cooper's novels.have a lie-in• Thou shalt not have a lie-in on Sunday morning? 