un ‧ mask /ʌnˈmɑːsk $ -ˈmæsk/ BrE AmE verb [transitive]
to make known the hidden truth about someone:
He was one of the most high-ranking spies ever unmasked by the CIA.
un ‧ mask /ʌnˈmɑːsk $ -ˈmæsk/ BrE AmE verb [transitive]
to make known the hidden truth about someone:
He was one of the most high-ranking spies ever unmasked by the CIA.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012