bases

To ensure one's safety or success by dealing with every potentially problematic aspect of a situation or activity. A reference to baseball, in which the defensive players must make sure all bases (and baserunners who may occupy them) are accounted for. Primarily heard in US, South Africa. We have to be sure to cover our bases before the trial begins so that we aren't surprised by anything the prosecution throws our way.

To be well-prepared for every possible outcome. We need to cover all bases here—check every office and make sure it's been evacuated. I know I don't have the best grades, so I covered all bases by applying to 15 colleges.

To found or root something on a particular idea or occurrence. A noun can be used between "base" and "on" or "upon." My love of science is based upon an interest in experimentation. Unfortunately, she has a low opinion of me. I think she based it on our first meeting, which didn't go well.

to deal with every possibility Those movie awards cover all the bases - best villain, best fight, best kiss, best everything.

to deal with every part of a situation or activity It's a pretty full report. I think we've covered all the bases.