1. to remove a mask from someone or something
2. to reveal the true nature or identity of someone or something

Examples

• The guests unmasked themselves at midnight during the masquerade ball.
• She slowly unmasked her face to reveal her identity.
• The investigation helped unmask the corrupt politician.
• The journalist worked to unmask the truth behind the scandal.
• His true intentions were unmasked during the trial.
• The detective finally unmasked the real killer.
• The documentary unmasked the company’s illegal practices.