To Break Something
To Damage Something, To Destroy Something
transitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means break and this verb vocab version means to break something.
You're the one actively doing the breaking here, so there's always a direct object involved. You know this because someone is trying to sue (す) you for the things you've broken.
This word uses the kun'yomi reading こわ, which you didn't learn with the kanji. Here's a mnemonic to help you out:
When you feel like you want to break something, you go for a koala (こわ). No, not a real koala. A beautiful ceramic koala. Watch it shatter on the ground, because you wanted to go and break it. What a jerk you are.
子供が、ガラス製のワニカニの置物を壊してしまったんです。
My child accidentally broke the glass WaniKani ornament.
関係を壊したくなかったので、言葉選びには気をつけました。
I was careful with my choice of words because I didn't want to damage the relationship.
無理なダイエットを続けると、体を壊す可能性があります。
Continuing an extreme diet may harm your health.
この河豚を自分なりに料理してみたんですが、お腹を壊してしまいました。
I cooked this blowfish in my own way and it wrecked my stomach.