cover all the bases
To account for or provide a way to address every possible outcome, scenario, contingency, etc. We need to cover all the bases here—the investigation should explore every avenue. I covered all the bases by applying to 15 colleges.
cover all the/your ˈbases
(especially American English) consider and deal with all the things that could happen or could be needed when you are arranging something: Are you sure we covered all our bases on this?We cover all the bases from creating a market for your business through closing the sale.