自首

zìshǒu

(1) [surrender; give oneself up to (the police, justice, etc.); criminate oneself; deliver oneself up; confess one's crime]∶自行投案, 承认罪责

她劝他向警察自首

(2) [surrender; give oneself up to the enemy]∶向敌人投降告密

老福, 好好地想想吧!向敌人自首了, 还算个中国人吗?--胡丹佛《把眼光放远一点》