Meaning : A high bid that is intended to prevent the opposing players from bidding.
Synonyms : pre-empt, preemptive bid
Meaning : Acquire for oneself before others can do so.
Meaning : Take the place of or have precedence over.
Example :
Live broadcast of the presidential debate preempts the regular news hour.
Discussion of the emergency situation will preempt the lecture by the professor.
Synonyms : displace
Meaning : Gain possession of by prior right or opportunity, especially so as to obtain the right to buy (land).
Meaning : Make a preemptive bid in the game of bridge.