The idiom "倒打一耙" is formed directly from a literal description in the classic novel "Journey to the West", where the character Zhu Bajie, armed with a rake, unexpectedly swings it backwards to strike an opponent; the characters 倒 (reverse), 打 (hit), 一 (one), and 耙 (rake) combine to depict this specific backward strike, which then figuratively came to represent the act of blaming one's accuser instead of admitting fault.