Pull a curtain back or to one side to let in more light or to discover what is behind it. For example, The sun was so pleasant I drew the curtains. [c. 1500 ]
Block or conceal something. For example, Let's draw the curtain over this matter; no one needs to know more. [c. 1500 ] Also see: draw a veil
то есть означать противоположные действия.
ну как это так?