Definition: stop (someone or something) from doing something or being in a certain state
Usage: We must prevent the cancer from spreading; His snoring kept me from falling asleep; Keep the child from eating the marbles
Main entry: forbid, foreclose, forestall, preclude, prevent
Definition: keep from happening or arising; make impossible
Usage: My sense of tact forbids an honest answer; Your role in the projects precludes your involvement in the competitive project