For example Lying to a court after you have sworn to tell the truth is such a serious offence that is has its own name: perjury. Show source/s Plain English Campaign Give feedback This page was not useful This page was useful Thank you for your feedback. If you have another few minutes please take the time to tell us about our new Dictionary service. Thank you for your answer, if you can tell us more that would really help Update
Perverting the course of justice Doing something to interfere with the justice system (such as misleading the court or intimidating witnesses).