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prevent

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prevent/prɪˈvɛnt/verb
preventspreventedpreventing
prevent
/prɪˈvɛnt/
verb
preventspreventedpreventing
Learner's definition of PREVENT  
[+ object]
: to stop (something) from happening or existing
: to make (someone or something) not do something : to stop (someone or something) from doing something — often used without from in British English

— preventable

/prɪˈvɛntəbəl/adjective

— preventer

noun,pluralpreventers[count]
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