The idiom **忍无可忍 (rěn wú kě rěn)** is formed through a classical Chinese grammatical structure that expresses a critical limit or climax. It is constructed by combining the verb **忍 (rěn)**, meaning "to endure" or "to tolerate," with the phrase **无可 (wú kě)**, meaning "there is nothing that can be." The entire compound follows a parallel and intensifying pattern: the first "忍" sets the action (enduring), "无可" negates the possibility of continuation, and the final "可忍" (can be endured) acts as the object of that negation. Thus, the literal reading is "to endure until there is nothing that can be endured," creating a powerful rhetorical effect of reaching an absolute breaking point where patience is completely exhausted and no further tolerance is possible.