offender noun
1 person who commits a crime
ADJ. alleged | convicted | first As a first offender, he received a lenient sentence. | persistent | adult, juvenile, young | sex
VERB + OFFENDER sentence
2 sb/sth that causes trouble
ADJ. main, worst As regards pollution, old diesel-engined vehicles are the worst offenders.
You can also check other dicts: offender (English, 中文解释 ), wordnet sense, Collins Definition