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general::
1. 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] 2. 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.
American Heritage Idioms