to defend against; to protect against
to prevent; to avert; to avoid
to stop; to stay (e.g. the night); to cease; to put an end to
to check; to hold back; to keep at bay; to stop; to prevent; to stem; to curb; …
風邪を防ぐにはうがいが大切。
Gargling is important to prevent colds.
交通事故を防ぐために常に注意しましょう。
I pay attention to prevent accidents.
堤防を築いて洪水の被害を防いだ。
They built a levee and prevented flood damage.