save your (own) skin / hide / neck
(尤指不惜置他人于困境而)保全自己的性命,使自己免受惩罚
to try to avoid death, punishment, etc., especially by leaving others in an extremely difficult situation
To save his own skin, he lied and blamed the accident on his friend.为了自保,他竟然说谎,把事故的责任推到朋友身上。
释义来自《牛津高阶英汉双解词典》第 9 版