(idiom) the weak cannot win against the strong, literally the arm cannot twist harder than the thigh; also written as [[胳膊扭不过大腿|胳膊扭不過大腿|ge1 bo5 niu3 bu5 guo4 da4 tui3]]

oversized; larger than the allowed or standard size, especially for baggage or cargo

the underdog cannot match a superior force, literally the arm cannot twist harder than the thigh