self-defense (US) noun
or British self-defence /ˌsɛlfdɪˈfɛns/ or British self-defence /ˌsɛlfdɪˈfɛns/ Learner's definition of SELF-DEFENSE
[noncount]
1
: the act of defending yourself, your property, etc.自卫;自我保护 2
: skills that make you capable of protecting yourself during an attack自卫术;防身术