Definition of "roost"

roost¹

/ɹuːst/

noun
plural roosts
1. The place where a bird sleeps (usually its nest or a branch).
  Quotations
  He clapp'd his wings upon his roost.
  1700, [John] Dryden, “The Cock and the Fox: Or, The Tale of the Nun’s Priest, from Chaucer”, in Fables Ancient and Modern; […], London: […] Jacob Tonson, […]
2. A group of birds roosting together.
3. A bedroom
4. (Scotland) The inner roof of a cottage.
verb
third-person singular simple present roosts, present participle roosting, simple past and past participle roosted
1. (intransitive, of birds or bats) To settle on a perch in order to sleep or rest
2. (figurative) to spend the night
  Quotations
  The UPS package centre for central London, a brief walk from Kentish Town tube station, holds a below-ground bay in which 170 vans roost every night.
  2019 November 21, Samanth Subramanian, “How our home delivery habit reshaped the world”, in The Guardian‎

roost²

/ɹuːst/

noun
plural roosts
1. (Shetland and Orkney) A tidal race.
  Quotations
  Sometimes the whole tract swung to one side, like the tail of a live serpent; sometimes, for a glimpse, it would all disappear and then boil up again. What it was I had no guess, which for the time increased my fear of it; but I now know it must have been the roost or tide race, which had carried me away so fast and tumbled me about so cruelly, and at last, as if tired of that play, had flung out me and the spare yard upon its landward margin.
  1886 May 1 – July 31, Robert Louis Stevenson, Kidnapped, being Memoirs of the Adventures of David Balfour in the Year 1751: […], London, Paris: Cassell & Company, published 1886

roost³

/ɹuːst/

verb
third-person singular simple present roosts, present participle roosting, simple past and past participle roosted
1. Alternative form of roust