1. root (of a plant)
霧を吸って成長した木はどこまでも地下に根を伸ばしていく。Trees that grew by absorbing mist extend their roots endlessly underground.
2. root (of a tooth, hair, etc.); center (of a pimple, etc.)
3. root (of all evil, etc.); source; origin; cause; basis
世界はあまりに広く、争いの根はあまりに深い。The world is too wide, and the roots of conflict are too deep.
4. one's true nature
ほらな、彼は根は悪い子じゃないんだよ。See, he's not a bad kid at heart.
5. (fishing) reef