godan verb (-gu), transitive verb
defend against; protect against
Used when stopping harm, attack, weather, danger, etc. from reaching or affecting someone or something.
兵士たちは敵の攻撃を防いだ。
The soldiers defended against the enemy attack.
厚いカーテンで外の寒さを防ぐ。
Thick curtains protect against the cold outside.
godan verb (-gu), transitive verb
Used for taking action so that an accident, problem, loss, spread, or other unwanted event does not occur.
事故を防ぐために、道路に標識を増やした。
They added more road signs to prevent accidents.
手洗いは感染の拡大を防ぐ。
Handwashing prevents the spread of infection.