The journalist traveled the city 'disguised as' [=dressed like; pretending to be] a beggar.
She 'disguised' herself 'as' a musician to get into the concert hall early.
He tried to 'disguise' his voice on the phone but I could tell it was him.
(..) You're telling me that this thing can imitate anything it touches? Anything it samples by physical contact. Can't be real! It could disguise itself as a pack of cigarettes? Only objects of equal size. Why not a bomb or something to get me? It can't form complex machines. (..)1991 Terminator 2: Judgment Day