透

By extension: “to seep in,” “to leak,” “to reveal,” “to become transparent.”

Phono-semantic compound:

辵 (착, “to walk slowly; movement radical”) – provides the meaning (indicating motion or passing through);

秀 (수, “excellent”) – provides the sound.

In Modern Chinese, 透 is very common and has a wide range of meanings, including:

• “to penetrate, to go through” (투과하다);

• “to leak (information)” (비밀이 새다);

• “to be seen through, to be transparent” (비쳐 보이다);

• “thoroughly, completely” (철저히), as in 看透 (to see through something completely).

The reading 숙 (숙) (“놀랄 숙”) is historically attested but not used in words or idioms today.