Answer: preemptive

AnswerCrossword Clue
PREEMPTIVEOf a certain bridge bid.
preemptiveof or pertaining to preemption
preemptiveRelating to the purchase of goods or shares by one person or party before the opportunity is offered to others
preemptiveDenoting a bid, typically an opening bid, intended to be so high that it prevents or interferes with effective bidding by the opponents
preemptiveServing or intended to preempt or forestall something, esp. to prevent attack by disabling the enemy