There are 2 definitions of roost in English:

roost1

Syllabification: roost
Pronunciation: /ro͞ost
 
/

noun

A place where birds regularly settle or congregate to rest at night, or where bats congregate to rest in the day.
More example sentences
  • The average pet bird roosts on the same plastic or wooden dowel every night and most of the day.
  • High concentrations of the organism can be found in bird roosts, caves inhabited by bats, school yards, areas with rotten or decaying wood, and chicken coops.
  • A bald eagle glides by en route to its evening roost on the branch of a cottonwood tree.

verb

[no object] Back to top  
(Of a bird or bat) settle or congregate for rest or sleep: migrating martins and swallows were settling to roost
More example sentences
  • Faced with the blank white page, I tried to visualize the knoll where I sat, gazing across a broad area of the river to a point where some birds were roosting.
  • Birds roosted in the gables and in the huge old trees around the property.
  • It is a great feeling to see the birds roosting, the bees gathering honey… We follow the bee's path.

Origin

Old English hrōst, related to Dutch roest; of unknown ultimate origin.

Phrases

come home to roost

(Of an action, scheme, etc.) recoil unfavorably upon the originator: ensuring that the liability does not come home to roost
More example sentences
  • Seems like a clear case of chickens coming home to roost, most unhappily for those like the old or handicapped who will now be left wanting.
  • But if we wait until they have thoroughly ravaged the rest of the world, there will be no one left to show solidarity with us when the chickens come home to roost.
  • He may soon join the rogues' gallery of aging racists for whom the chickens have come home to roost.

rule the roost

see rule.

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Pronunciation: ˌprēməˈniSHən
noun
a strong feeling that something will happen …

There are 2 definitions of roost in English:

roost2

Line breaks: roost

Entry from British & World English dictionary

noun

(In the Orkneys and Shetlands) a tidal race.

Origin

mid 17th century: from Old Norse rǫst.

Definition of roost in: