noun
a means of altering one's appearance in order to conceal one's identity
verb
to change or alter one's appearance in order to conceal one's identity
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The spy used a clever disguise to blend in with the crowd.
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She put on a disguise to sneak into the party without being noticed.
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He threw on a disguise to avoid being seen by his ex-girlfriend.
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His smile was a disguise, hiding the pain he was feeling inside.