If you're talking about physically covering something:
* Uncover: This is the most direct opposite, meaning to remove a covering.
* Reveal: This implies making something visible that was previously hidden.
* Expose: This suggests making something vulnerable or susceptible to harm.
If you're talking about covering a story or event:
* Ignore: This means to pay no attention to something.
* Dismiss: This suggests rejecting something as unimportant or irrelevant.
* Expose: This implies revealing hidden information or wrongdoing.
If you're talking about covering a cost or expense:
* Uncover: This could mean revealing a hidden cost.
* Leave uncovered: This means to not pay for something.
* Pay out of pocket: This means to pay for something yourself, rather than being covered by insurance or another source.
Other possibilities:
* Discover: This is the opposite of "cover up," meaning to uncover something hidden or unknown.
* Unmask: This means to reveal someone's true nature or identity.
It's important to consider the context in which "cover" is being used to determine the most appropriate opposite word.