to solve a problem, perform a task, etc.
Example:
- Not all complaints are so easily dealt with.
- The two issues should be dealt with separately.
- We discussed different ways of dealing with the problem.
- Have you dealt with these letters yet?
- He's good at dealing with pressure.
to be about something
Example:
- Her poems often deal with the subject of death.
- This topic is dealt with at greater length in the following chapter.