to stop being involved in a situation because it is difficult to deal with or does not give you any advantages

You can't just walk away from a marriage at the first sign of a problem. 你不能婚姻稍有问题就想摆脱掉了事。

to escape an accident without being badly hurt

She overturned the car, but walked away from it without a scratch. 她翻了车，可是却平安无事，一点擦伤都没有。