離經(jīng)叛道

- discard the classics and rebel against orthodoxy; be guilty of heterodoxy; be heretical and deviate from the true teachings; depart from the classics and rebel against orthodoxy; depart from the right way; departing from established practices; desert and rebel; deviate from orthodox truth; deviate from the canon and strike out into byways; deviate from the path of righteousness; wander [go astray] from the right (path)