Lay/put your cards on the table
Definition 1 of 1
Pro Tip 1/3Honest Intention
Used when someone intends to be completely open and honest, without hiding anything. 
In the meeting, she decided to lay her cards on the table about her company's financial status.
Pro Tip 2/3Critical Moments
Often used at key moments where transparency is crucial to advance a situation or resolve an issue. 
After hours of negotiation, both parties laid their cards on the table to find common ground.
Pro Tip 3/3Informal Setting
Commonly used in casual or less formal situations, like conversations among friends or family. 
I think it's time we put our cards on the table and discuss what's really bothering us.