covert in WordNet English dictionary

1. 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"
   screen  cover  covert  concealment 
   
2. a flock of coots
   covert 
   

1. secret or hidden; not openly practiced or engaged in or shown or avowed
   "covert actions by the CIA"; "covert funding for the rebels"
   covert 
   
2. (of a wife) being under the protection of her husband
   "a woman covert"
   covert