To have cuts and bruises all over the body; (figuratively) to be utterly defeated, discredited, or severely criticized to the point of having no valid argument or defense left.
他因为粗心大意，在工作中犯了严重的错误，被上级批评得肌无完肤
Due to his carelessness, he made a serious mistake at work and was severely criticized by his superior, leaving him utterly discredited.
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