Simple Definition of unmask
: to reveal the true identity or nature of (someone or something)
Full Definition of unmask
1 : to reveal the true nature of : expose
2 : to remove a mask from
: to remove one's mask
Examples of unmask
He was unmasked as a spy.
<the killer's identity won't be unmasked until the season's final episode>
First Known Use of unmask
Seen and Heard
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