Entry 2 senses · 2 variants Webster, 1913 Unmask /ən-măsk'/ · Un·mask · IPA /ʌnˈmæsk/ v. t. v. i. 01 v. t. To strip of a mask or disguise; to lay open; to expose. 1. To strip of a mask or disguise; to lay open; to expose. 02 v. i. To put off a mask. 1. To put off a mask.