Cover One's Feet Meaning

(euphemistic, biblical) to lower one’s garment, especially to urinate or defecate.

Example: When he was gone out, his servants came; and when they saw that, behold, the doors of the parlor were locked, they said, Surely he covers his feet in his summer chamber. (Judges 3:24)
And he came to the sheepcotes by the way, where was a cave; and Saul went in to cover his feet: and David and his men remained in the sides of the cave. (1 Samuel 24:3)