1. (

• prevent ,
• forestall ,
• foreclose ,
• preclude ,
• forbid ,

) keep from happening or arising; make impossible; "My sense of tact forbids an honest answer"; "Your role in the projects precludes your involvement in the competitive project" ;

2. (

• anticipate ,
• foresee ,
• forestall ,
• counter

) act in advance of; deal with ahead of time ;