A repeat offender is someone who commits the same sort of crime more than once.
repeat offender in British English
(rɪˈpiːt əˈfɛndə)
noun
someone who has committed crimes more than once or several times
Examples of 'repeat offender' in a sentence
repeat offender
Although unelected, she is in charge of sensitive issues including laws that will bring tougher sentences for young repeat offenders, introducing stiffer minimum penalties.