a flock of coots
"The water was teeming with dozens of black ducks, which turned out to be a large covert of coots when we got closer."
a covering that serves to conceal or shelter something
"a screen of trees afforded privacy"
"under cover of darkness"
"the brush provided a covert for game"
"the simplest concealment is to match perfectly the color of the background"
A covering.
"The secret agent hid his identity under a plain gray coat, which served as a perfect covert for his surveillance mission."
secret or hidden; not openly practiced or engaged in or shown or avowed
"covert actions by the CIA"
"covert funding for the rebels"
Hidden, covered over; overgrown, sheltered.
"The old cottage stood in a covert of trees at the edge of the forest, its roof hidden by thick ivy and surrounded by tall ferns."
A surname.
"The local history club invited Mr. Covert to speak about his family's early days in the valley."