/ˈkɒmən lɔː ˈɒfəns/ – Phrase
Definition: Tội phạm theo luật pháp thông thường.
A more thorough explanation: a violation of law formed through court decisions (as opposed to laws created through written legislation) and punishable based on them
Example: The Treason Act 1351 of England codified and curtailed the common law offence of treason.