Definitions

1. noun

a person who is thought to be guilty of something, especially in a way that is not proven

“The politician’s critics accused him of being the new Banquo, haunting his successor’s every move.”

2. proper noun

William Banquo, a Scottish nobleman in Shakespeare’s play Macbeth

“In the play, Macbeth sees the ghost of Banquo at a feast, symbolizing his guilt and paranoia.”