Verb prevent has 2 senses
  1. prevent, forestall, foreclose, preclude, forbid - keep from happening or arising; have the effect of preventing; "My sense of tact forbids an honest answer"
    Sample sentences:
    Somebody ----s something
    Something ----s something
  2. prevent, keep - prevent from doing something or being in a certain state; "We must prevent the cancer from spreading"; "His snoring kept me from falling asleep"; "Keep the child from eating the marbles"
    Antonyms: let, allow, permit
    Derived form: noun prevention1
    Sample sentence:
    They prevent him from writing the letter