There are 2 definitions of roost in English:

roost1

Line breaks: roost
Pronunciation: /ruːst
 
/

noun

A place where birds regularly settle or congregate to rest at night, or where bats congregate to rest in the day: birds were hurrying to their evening roosts
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 in the past) have an unexpected adverse consequence for the person responsible: for the overextended borrowers, the chickens have come home to roost
[from the proverb ‘curses, like chickens, come home to roost’]

Definition of roost in:

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Word of the day humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music

There are 2 definitions of roost in English:

roost2

Line breaks: roost
Pronunciation: /ruːst
 
/

noun

(In the Orkneys and Shetlands) a tidal race.

Origin

mid 17th century: from Old Norse rǫst.

Definition of roost in: