verb

prevent

to prevent, to stop, to hinder

We must prevent the spread of the virus.

We must prevent the spread of the virus.

The rain prevented us from going out.

The rain prevented us from going out.

((sth.)) to prevent (sth.) We must prevent accidents.

((sb./sth.)) ((from -ing)) to prevent (sb./sth.) from (doing sth.) The noise prevented me from sleeping.

Synonyms: stop, hinder, avert; Antonyms: allow, permit, cause

From Latin 'praevenire' meaning 'to come before, anticipate', from prae- 'before' + venire 'to come'. The meaning shifted to 'hinder'.

To 'pre-vent' is to put a vent or block in place *before* something happens.

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