She went 'out on a limb' to help you. [=she took a chance; she did something that meant she could be criticized or harmed in some way]
The angry mob would have 'torn him limb from limb' if the police hadn't protected him.
If you try to oppose the boss yourself, you're likely to get caught 'out on a limb'.
(..) Every day. But it came at a cost. And I wanted more of this. I wanted to expand. To create more places like this. Men and women lost their limbs. Children lost their parents because I sent them into battle against the wasted when I did not need to. This is different. (..)2017 TvShow: The Walking Dead Title: Rock in the Road Season: 7 Episode 9