young offender institution
noun /ˌjʌŋ əˈfendər ɪnstɪtjuːʃn/
/ˌjʌŋ əˈfendər ɪnstɪtuːʃn/
- a type of prison in Britain for young people who have committed crimes. Young offender institutions are for people aged 15–17 who have been found guilty in youth courts and people aged 18–20 who have been found guilty in ordinary courts for adults. They used to be called Borstals.