draw the curtain on (something)
1. To cease doing something; to bring something to an end. No one is coming to the party; let's just draw a curtain on it and go home. The senator, now 83, draws a curtain this Friday on her illustrious career in politics.
2. To conceal something; to keep something a secret. The police have been accused of drawing a curtain on the officer's alleged involvement with the teenager's murder.