verb · to naturally shed or discard the tail, typically as a self-defense mechanism in lizards and other animals

壁虎遇到危险时会主动断尾以迷惑捕食者。

to surgically or manually shorten an animal's tail for health, hygiene, or aesthetic reasons

为了防止细菌滋生，牧场主会给刚出生的羊羔断尾。