To Cure
To Heal, To Ease
transitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb.
The kanji itself means cure, and this verb means to cure, to heal or to ease something. This particular verb is when someone does the curing. The illness or injury doesn't just get better by itself. How can you remember that? Because when you try to heal someone and you mess up, they can try to sue (す) you.
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:
I need you to heal him, and I need you to heal him right now (なお). NOW NOW NOW!
This also shares the reading for 直す, a very similar word you learned previously, which means "to fix." I'm guessing that the Japanese word なおす was only one word ("to fix" and "to cure" are pretty similar, right?). Then, there were two Chinese words for it (as you can see with the kanji), so the one Japanese word got split into two very similar words.
この病気を治すには薬が必要です。
Medications are needed to cure this disease.
キズを早く治す方法を知っていますか？
Do you know how to heal scratches fast?
ノドのイガイガを治すには、ネギを首にくくっておくのが一番です。
To cure a scratchy throat, it's best to tie a leek around your neck.