self-defence
noun [ U ] UK (US self-defense) uk/ˌself.dɪˈfens/ us/ˌself.dɪˈfens/
自卫
protection of yourself, either by fighting or discussion
He used the gun in self-defence. 他出于自卫使用了枪。
In self-defence, I have to say that I only did what you asked me to do. 为了自我辩护，我不得不说我只是做了你要我做的事。
自卫防身术
the skill of fighting without weapons to protect yourself
She goes to self-defence classes for women. 她参加了女子防身术训练班。