petty treason
offence under the common law of England which involved the betrayal (including murder) of a superior by a subordinate
en-GB/ˈpɛtɪ ˈtɹiːzən/
en-US/ˈpɛˌti ˈtɹizən/
offence under the common law of England which involved the betrayal (including murder) of a superior by a subordinate