1. Back, or behind.
2. Back of the fist.
3. Filal piety, especially to one's lord.
4. Red.
5. A light ray.
6. Ancient or old.
7. Fox.
8. High, tall, or expensive.
9. Mouth, oral, or nose.
10. Retrospect or to look back.
11. Small, minor, or short.
12. Tiger.
13. Arc of back.

There are many Japanese and Chinese characters that give the sound Ko, hence the extensive list of meanings.

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