She preempted with a bid of three spades to block the opponents' plan.

preempted 是动词 preempt 的过去式。preempt 由前缀 pre-（表示"在...之前"）和词根 empt（来自拉丁语 emere，意为"拿取"）组成，字面意思是"提前获取"。在桥牌术语中，preempt 指"抢先叫牌"，即通过主动叫牌来干扰对手的叫牌计划。