Self-defense means fighting off something or another person to protect yourself and maybe others. Ways of self-defence include martial arts or using a weapon. Sometimes, self defense can cause serious harm to the other person. In most nations, you cannot be prosecuted for this harm. In the United States, an act of self-defense can only count as self defense if the victim is in a situation that can cause them serious injury or death. In international law all persons have the right to self-defense.
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This telescopic steel security baton is sold to the public in Japan (2009).
Self-defence Facts for Kids. Kiddle Encyclopedia.