To Get Better
To Get Well, To Heal
intransitive 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 治 means cure, but this verb refers to the natural process of getting better: to get better, to get well, or simply to heal. This is an intransitive verb, meaning that it happens on its own. Nobody cures you, you just get better.
Since this word has okurigana (hiragana attached to the kanji) you know that it's probably going to be the kun'yomi reading. You didn't learn this with the kanji, so here's a mnemonic to help you out:
When you get sick, your mom calls every day to ask, "Are you better now (なお)?" How about NOW!? How about NOW!? Jeez Mom, just let me rest!
お前の病気は必ず治る。
Your disease will most definitely be cured.
ケガは治ったが、きずあとが残った。
His injuries have healed, but the scars remain.
「バカは一生治らない」っていうことわざ知ってる？
Do you know the saying "stupidity can never be cured"?