胳膊拧不过大腿

gē bo nǐng bu guò dà tuǐ

(idiom) the weak cannot overcome the strong

胳

gē

armpit

膊

bo

shoulder

拧

nǐng

mistake

不

bu

no; not so

过

guò

to cross

大

dà

big; large; great

腿

tuǐ

hip bone