只剩下一把骨头

只剩下一把骨头:

Literally means:

reduced to a bag of bones

Actually means:

It means extreme leanness of a person who can be described as a bag of bones without flesh at all. Since such leanness is abnormal, this phrase is a compassionate overstatement.

形容人特别瘦，瘦得不像样子，让人觉得身上只有骨头，没有肉。这种瘦往往是不正常的，因此说话时有夸张的语气。含同情意味。