Unmask (verb)

1. To remove a mask from someone or something, revealing their true identity or nature.
2. To reveal or disclose something that was previously hidden or kept secret.

Origin:

From the old english word "unmæscian", which means to reveal or to expose.

Examples:

1. She unmasked the thief, who turned out to be her own brother.
2. The investigation unmasked a vast conspiracy.
3. The singer unmasked himself as the lead singer of the band.
4. The detective unmasked the criminal's true identity.
5. The politician was unmasked as a fraud.