Refers to grave criminal offenses, often used in legal or news contexts. The cross-reference 重犯 is a synonym.
See also: 重犯
He was arrested for a serious crime.
We are focusing on the prevention of serious crimes.
重犯 is a synonym for 'serious crime' or 'felony', often used in legal contexts. 重大犯罪 is a more descriptive compound literally meaning 'serious crime'.
Compound of 重大 (serious, grave) and 犯罪 (crime).