What does action mean when solving a problem

An action is a decision to do something about it.

Explanation:

When there is a problem individuall, in a group, or in a company, all involved should be concerned and try to look for a solution. Some thought, reflection, analyzing, and discussion are steps that may help to indicate a solution. Nevertheless, even with the best plan and intention, if no action is taken, there might not be any solution.

Expelled means that something is forced out or made to come out abruptly.