To reveal something is to make it known or visible, especially if it was hidden or secret before. It can be used for physical things, like taking a cover off, or for information, like telling a secret.
From Old French *reveler* “to disclose, uncover,” from Latin *revelare* “to unveil,” from *re-* “again” + *velum* “veil, covering.” The idea is literally to “un-veil” something.
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