Definition of mask verb from the Oxford Advanced American Dictionary

     

    mask

     verb
    verb
    NAmE//mæsk//
     
    mask somethingVerb Forms present simple I / you / we / they mask
     
    he / she / it masks
     
    past simple masked
     
    -ing form masking
     
     
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  1. 1to hide a feeling, smell, fact, etc. so that it cannot be easily seen or noticed synonym disguise, veil
  2. 2 She masked her anger with a smile. Thesaurushideconceal cover disguise mask camouflageThese words all mean to put or keep someone or something in a place where they/it cannot be seen or found, or to keep the truth or your feelings secret.hide to put or keep someone or something in a place where they/it cannot be seen or found; to keep something secret, especially your feelings:He hid the letter in a drawer. She hid her disappointment from her brother.conceal (formal) to hide someone or something; to keep something secret:The paintings were concealed beneath a thick layer of plaster. Tim could barely conceal his disappointment. When it is being used to talk about emotions, conceal is often used in negative statements.cover to place something over or in front of something in order to hide it:She covered her face with her hands.disguise to hide or change the nature of something, so that it cannot be recognized:He tried to disguise his accent.mask to hide a feeling, smell, fact, etc. so that it cannot be easily seen or noticed:She masked her anger with a smile.camouflage to hide someone or something by making them/it look like the things around, or like something else:The soldiers camouflaged themselves with leaves and twigs.Patterns to hide/conceal/mask something behind something to hide/conceal something under something to hide/conceal something from somebody to hide/conceal/disguise/mask the truth/the fact that… to hide/conceal/disguise/mask your feelings
See the Oxford Advanced Learner's Dictionary entry: mask