v.1. To put forth reasons supporting something; make a case for something: The students argued for a new gymnasium, but the administration did not want to spend the money needed to build it.
2. To act as evidence or support for something: These new facts argue for a different analysis. The fact that your route to work is so slow argues for giving my suggestion a try.
3. To speak on behalf of someone in an argument: Lawyers are supposed to argue for their clients.