prevent - definition and synonyms

verb [transitive] 

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present tense
present participlepreventing
past tenseprevented
past participleprevented
  1. 1
    to stop something from happening

    If necessary, add a little water to prevent sticking.

    prevent something (from) happening:

    Rubber seals are fitted to prevent gas from escaping.

  2. 2
    to stop someone from doing something

    We tried to prevent her, but she was determined to go.

    prevent someone (from) doing something:

    The owner is prevented by law from making any major changes.

    She was sure the noise would prevent her sleeping at night.