noun
a covering for all or part of the face, worn as a disguise, or to amuse or terrify others
verb
to cover or conceal with or as if with a mask
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The surgeon carefully put on his mask before entering the operating room.
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Make sure to wear your mask when you go out in public.
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I can't believe she's still not wearing a mask, it's so irresponsible.
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She wore a mask of indifference to hide her true feelings.