to get rid of somebody/something that you do not want or cannot keep
Example:
- the difficulties of disposing of nuclear waste
- to dispose of stolen property
- Radioactive waste must be disposed of safely.
to deal with a problem, question or threat successfully
Example:
- That seems to have disposed of most of their arguments.
to defeat or kill somebody
Example:
- It took her a mere 20 minutes to dispose of her opponent.