1For water, air, etc. to be clear and transparent, without cloudiness.
この湖は水が澄んでいて、魚がよく見える。
The water in this lake is clear, and you can see the fish well.
高原の空気は澄んでいて気持ちがいい。
The air on the plateau is clear and refreshing.
雨が上がると空が澄んで、星がよく見えた。
After the rain stopped, the sky cleared up and the stars were clearly visible.
2For a voice or sound to be clear and resonant, without noise.
彼女の澄んだ声が会場中に響いた。
Her clear voice resonated throughout the hall.
早朝、澄んだ鐘の音が聞こえてきた。
In the early morning, the clear sound of a bell could be heard.
3For one's mind to become calm and clear, free of confusion or worry.
座禅を組んでいると、次第に心が澄んでくる。
While sitting in zazen meditation, my mind gradually becomes clear.
静かな森を歩くと気持ちが澄んでいく気がする。
Walking through a quiet forest, I feel my mind becoming clear and calm.
4In phonetics, for a sound that would normally be voiced to instead be pronounced as an unvoiced (clear) sound.
方言によっては「が」が澄んで「か」に近く発音されることがある。
In some dialects, が is devoiced and pronounced closer to か.