Etymology
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unmask (v.)

1580s in figurative sense, c. 1600 in literal sense (transitive and intransitive), from un- (2) "reverse, opposite of" + mask (v.). Related: Unmasked; unmasking.

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Definitions of unmask

unmask (v.)
reveal the true nature of;
The journal article unmasked the corrupt politician
Synonyms: uncloak
unmask (v.)
take the mask off;
unmask the imposter
From wordnet.princeton.edu