(chiefly Brit) He was once one of the most powerful men in the government, but now he's largely a spent force. [=he no longer has the power or influence he once had]他曾经是政府中最有权力的人之一，现今已失势。
2
somewhat formal:tired and drained of energy精疲力竭的
By the end of the race I was completely spent. [=exhausted]比赛结束时，我简直精疲力竭了。