Prevents

8 clues
Bars
Stops
Checks
Blocks
Thwarts
Forestalls
Nips in the bud
Keeps from happening
Similar answers:
Abasements
Abatements
Absents
Abutments
Accents
Accentshappen
Accentswillhappen
Accidents
Accidentsarewaiting
Accidentshappen
Accomplishments
Accoutrements
Acquiescents
Adddetergents
Addonestwocents
Adepartmentstoreandhe
Adherents
Adjustments
Adolescents
Adornments