vt. annul宣告…无效。
△3H.VI.2.1.174:“And now to London all the crew are gone / To frus-trate both his oath and what beside”. 现在这 一帮人全都去了伦敦，要把他的誓言和其他一切都宣布无效。
frustrate[frʌsˈtreit]
v. 阻止，妨碍，挫败 adj.受挫的，失败的
◇ be frustrated in 失败
‖ frustrate of contract 合同受挫
frustrate plans for aggression 挫败侵略计划
frustrate psychology 挫折心理
frustration n. 挫败，挫折
frustration-aggression hypothesis 挫折与攻击假设
frustration reading level 挫折阅读水平
frustration theory 挫折理论
frustration threshold 挫折阈限
frustration tolerance 挫折忍受力