1. To insert; To put in (such that there is a snug fit); To button; To put on (something that envelops, e.g. gloves, ring) word usually written using kana alone.

2. To have sex; To fuck colloquialism.

3. To pigeonhole (into a particular category)

4. To place a ring-shaped object around something (esp. one that restricts freedom, such as handcuffs)

5. To entrap; To set someone up (e.g. frame them for a crime, etc.)