flush
A group of birds that have suddenly started up from undergrowth, trees, etc.
Other meanings
A sudden flowing; a rush which fills or overflows, as of water for cleansing purposes.
Particularly, such a cleansing of a toilet.
Word history
From Middle English "flusshen".
Where this comes from
This definition is adapted from “flush” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.