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'.
(..) - No. - It's hell. It's the financial equivalent of a complete rectal examination. I would've killed this man. Torn him limb from limb. Ripped the flesh right off his bones. - Yeah? - It's George. Come on up. There he is, the man himself... (..)1991 TvShow: Seinfeld Title: The Truth Season: 3 Episode 2