noun, noun or participle which takes 'suru', intransitive verb
surrender; turn oneself in
Refers specifically to voluntarily surrendering to the police or authorities, usually after committing a crime. Often used in legal or news contexts.
犯人は警察に自首した。
The criminal turned himself in to the police.
自首すれば刑が軽くなる可
If you surrender, your sentence may be reduced.