{f} remove one's mask; remove a mask from; expose, uncover, reveal the true nature of
If you unmask someone or something bad, you show or make known their true nature or character, when they had previously been thought to be good. Elliott unmasked and confronted the master spy and traitor Kim Philby = expose. to make known the hidden truth about someone
{i} one who removes a disguise; discloser, one who reveals; one who shows the true nature of something; one who shows his true personality; one who fires a weapon to demonstrate fire power