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sleep-in

[sleep-in]
adjective
  1. live-in(def 1).
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noun
  1. a person who sleeps in at a place of employment.
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Origin of sleep-in

First recorded in 1950–55; adj., noun use of verb phrase sleep in
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018