这是一句法庭用语：（已判定）有罪，除非能证明是无罪的。法庭判罪之前正好倒过来innocent until proven guilty，即所“无罪推定”。
took it on the chin意思是”坚强面对“——以牙还牙。这是一个源自拳击场上的话语： He took it on the chin after he was hit on the nose.
后来用作挺身面对的意思：
The company has been taking it on the chin in recent months, but the future looks much brighter now and their sales are picking up.
