1To defend against or protect from danger or harm; to guard against external threats or attacks.
予防接種は重い病気を防ぐのに役立つ。
Vaccination helps prevent serious illnesses.
この塗料は腐食を防ぐ効果がある。
This coating has the effect of preventing corrosion.
警備員が不審者の侵入を防いだ。
The security guard prevented the suspicious person from entering.
2To prevent or avert an event or situation from occurring; to avoid accidents or problems beforehand.
早めの点検で事故を防ぐことができる。
Early inspections can prevent accidents.
計画を見直して不要なリスクを防いだ。
We reviewed the plan and averted unnecessary risks.
手洗いは風邪の感染を防ぐ基本だ。
Handwashing is a basic way to prevent catching a cold.