Uncover, v. t. [imp. & p. p. Uncovered; p. pr. & vb. n. Uncovering.]
Etymology: [1st pref. un- + cover.]
1. To take the cover from; to divest of covering; as, to uncover a box, bed, house, or the like; to uncover one's body.
2. To show openly; to disclose; to reveal. "To uncover his perjury to the oath of his coronation." Milton.
3. To divest of the hat or cap; to bare the head of; as, to uncover one's head; to uncover one's self.
1 other Webster entry under this spelling
Uncover, v. i.
1. To take off the hat or cap; to bare the head in token of respect. We are forced to uncover after them. Addison.
2. To remove the covers from dishes, or the like. Uncover, dogs, and lap. Shak.
Shades of meaning
Fernald lists uncover only as an antonym, under hide.
He lists it without comment; the entries above explain its neighbors.