worn to a shadow 骨瘦如柴；疲惫不堪

【例句】
By the end of that summer, many workers were worn to a shadow of themselves.
到那年复天结束时，许多工人都骨瘦如柴。

He was playing football with the children all afternoon. He was worn to a shadow when he came in.
他整个下午都在和孩子们踢足球。他进来时已疲惫不堪。