sumu
1.

To become free from impurities or cloudiness, resulting in clarity and transparency in liquids or the atmosphere, often evoking a sense of beauty.

2.

To reach a state of purity in thoughts or emotions, where distractions and negative feelings have diminished, allowing for a serene and focused mind.

3.

To resonate clearly and distinctly, particularly in sound, signifying a quality of sharpness or brilliance in auditory expression.

4.

To reveal or clarify truths and principles, illuminating understanding and providing resolution to previously obscured matters.

Example:

水が底まで澄んでいる。