:to make a mistake because you believe that your position is stronger or better than it really is因自不量力而失误;高估自己的地位
The union overplayed its hand by demanding too much, causing the company to withdraw what would have been its best offer.工会高估了自己的力量而提出了过高的要求,致使公司收回了他们此前提出的最佳方案。