百口莫辩

百口莫辩	bǎi kǒu mò biàn	(idiom) (of sb unfairly accused) to have all one's protestations fall on deaf ears; to be unable to convince sb of one's innocence
百	Bǎi	surname Bai
百	bǎi	hundred / numerous / all kinds of
口	kǒu	mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls
莫	Mò	surname Mo
莫	mò	do not / there is none who
辩	biàn	to dispute / to debate / to argue / to discuss