trump-card

n (a) card of the suit that is trumps 王牌; 将牌; 主牌. (b) (fig 比喻) way of gaining what one wants, esp after trying other ways; most valuable resource 为达到目的采取的方法（尤指已试过其他方法）; 最有效的一招: Finally she played her trump-card and threatened to resign. 最後她使出了绝招, 扬言要辞职.

trucker, trucking, truckle, truckle-bed, truculence, truculent, truculently, trudge, true, true north, true-blue, true-hearted, true-life, true-love, truely, truffle, trug, truism, truly, trump, trumpery, trumpet, truncate, truncated, truncheon, trundle, trundle-bed, trunk, trunk-call, trunk-road, truss, trust, trust company, trust fund, trusted, trustee, trusteeship, trustful, trustfully, trustfulness,