in law, formerly, concealment of treason or other serious crime by somebody who is not actually a participant
Amyas was guilty of something like misprision of treason in not handing him over to the nearest justice — Charles Kingsley
[Middle English from early French mesprison error, wrongdoing, from Old French mespris, past part. of mesprendre to make a mistake, from mes- mis-1 + prendre to take, from Latin prehendere to seize]