prevent

verb5

1. •
   to act so that something does not happen, or so that someone is not able to do something

   • I brush my teeth regularly to prevent tooth decay.
   • Barriers have been put up to prevent more people (from) entering the stadium.
2. •
   (no longer used) To take preventative measures.

   • I think you must be mad, and she shall not have a glimpse of it while I'm here to prevent! — 1897
3. •
   (no longer used) To be beforehand with; to anticipate.

   • their ready guilt preventing thy commands — 1699
4. •
   (no longer used) To come before; to precede.

   • We pray thee that thy grace may always prevent and follow us. — 1549
5. •
   (no longer used) To outdo, surpass.

   • With that he put his spurres vnto his steed, / With speare in rest, and toward him did fare, / Like shaft out of a bow preuenting speed. — 1596