Stick your neck out
Definition 1 of 1
Pro Tip 1/3Potential Consequences
Using the phrase suggests you're aware of possible negative outcomes for your actions. 
He stuck his neck out by criticizing the boss's decision in the meeting.
Pro Tip 2/3Supporting Others
It's often used when someone risks helping others or defending them. 
Sara stuck her neck out for her team, arguing they deserved more credit.
Pro Tip 3/3Metaphorical Risk
The phrase is metaphorical and doesn't refer to physical danger. 
By leaking the document, he was sticking his neck out to expose the truth.