cover all bases
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.
cover (one's) feet
A Biblical euphemism for defecation. (While positioned in that act, one's robe would cover one's feet.) A: "Where is Joe?" B: "Oh, he's in the restroom, probably covering his feet, if you know what I mean."