To Defend Against
To Protect Against, To Prevent
transitive verb, godan verb
You're doing a prevention. When you prevent something, what are you really doing? You're trying to defend against something from happening. That's why this verb is a little weird and means to defend or to protect against. It can also be to prevent, too, but just make sure you're thinking of it more like you're defending something with your prevention.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: You want to defend against the enemy? You should probably put out that fuse (ふせ) attached to that giant bomb first then.
どうやって事こを防ぐかについて、議論する必要があります。
We need to discuss how to prevent accidents.
ビエト達がてきを防いでいる間に、クリステンはコウイチ王子を日本へにがしました。
While Viet and the others were defending themselves against the enemy, Kristen had Prince Koichi escape to Japan.
このダウンジャケットは、寒さをとってもよく防いでくれますよ。
This down jacket will really protect you from the cold.