lift the lid on
US /lɪft ðə lɪd ɑn/
UK /lɪft ðə lɪd ɑn/
1.
to reveal something secret or previously hidden, often something scandalous or unpleasant
:
•
The investigation aims to lift the lid on corruption within the department.
•
A new documentary will lift the lid on the dark side of the fashion industry.