Lift, blow, etc. the lid off something - Idioms by The Free Dictionary
lift, blow, etc. the lid off something
lift the lid off (something)
To expose something to the public, often something scandalous or deceptive. That company's stock price plummeted after the media lifted the lid off the CEO's embezzlement scandal.
lift, blow, etc. the ˈlid off something (informal) tell people unpleasant or shocking facts about something: The story in today’s paper really lifts the lid off the use of drugs in horse racing.