As a Noun: 1. A BYPASS is an operation performed on or near the heart. The flow of blood is redirected so that it does not flow through a part of the heart which is blocked or diseased. Note: 1. There appears to be no commonly used Auslan sign for BYPASS. If you know a sign for BYPASS used by you or other Auslan users (deaf people or interpreters) please go to "missing sign feedback" and supply details. Thank you.