* Reveal: This is the most common antonym, meaning to make something known or visible.
* Disclose: Similar to reveal, but often implies a more formal or deliberate act of making something known.
* Uncover: This implies finding something that was hidden, often through investigation or effort.
* Expose: This implies making something vulnerable or open to attack.
* Show: A more general term for making something visible.
* Display: This implies presenting something in a way that is intended to be seen.
The best antonym for "conceal" will depend on the context of the sentence.