• (British) IPA: /ʌnˈmæsk/, /ʌnˈmɑːsk/
• (America) IPA: /ʌnˈmæsk/

unmask (unmasks, present participle unmasking; past and past participle unmasked)

1. (transitive) To remove a mask from someone.
2. (transitive) To expose, or reveal the true character of someone.
   • c. 1599–1602, William Shake-speare, The Tragicall Historie of Hamlet, Prince of Denmarke: […] (First Quarto), London: Printed [by Valentine Simmes] for N[icholas] L[ing] and Iohn Trundell, published 1603, OCLC 84758312 ↗, [Act I, scene ii] ↗, lines 35–36:

     The Charieſt maide is prodigall enough, / If ſhe vnmaske hir beautie to the Moone.

3. (intransitive) To remove one's mask.
4. (transitive, computing) To enable (an interrupt, etc.) by unsetting or setting the associated bit.

• French: démasquer
• Italian: smascherare
• Spanish: desenmascarar

• French: révéler, dévoiler, démasquer
• Italian: smascherare, palesare, scoprire
• Spanish: descubrir, revelar, demostrar

• French: démasquer
• Italian: smascherarsi
• Spanish: desenmascararse