Here the word "hands" refers to the wicked man's children. When he dies, his children will have to return everything that he took from others. (See: [[rc://en/ta/man/translate/figs-metonymy]])
The word "bones" represents his body. Being "full of youthful strength" represents being strong like a young person. AT: "His body is strong like a young person's body" (See: [[rc://en/ta/man/translate/figs-synecdoche]] and [[rc://en/ta/man/translate/figs-metaphor]])
The word "it" refers to his youthful strength. The metonym "lie down ... in the dust" represents dying. The strength dying is a metaphor for disappearing. AT: "but his youthful strength will die with him" or "but his youthful strength will disappear when he dies" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-metaphor]])