ˈkʌvɚ ˈkʌvə ˈskɹiːnɪŋ the act of concealing the existence of something by obstructing the view of it the cover concealed their guns from enemy aircraft scenery used to block the audience's view of parts of the stage that should not be seen the blocking of one sensation resulting from the presence of another sensation he studied auditory masking by pure tones