胳膊拧不过大腿
gē​bo​nǐng​bu​guò​dà​tuǐ

the weak cannot overcome the strong

Senses

胳膊拧不过大腿/ 胳膊擰不過大腿 gē​bo​nǐng​bu​guò​dà​tuǐ (also gē​bo​nǐng​bú​guò​dà​tuǐ) the weak cannot overcome the strong

(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 gē​bo​niǔ​bu​guò​dà​tuǐ

References

variant 胳膊拧不过大腿/胳膊擰不過大腿 → 胳膊扭不过大腿/胳膊扭不過大腿