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.
(..) And it signifies the Phantom is up to his old tricks. But I will catch him and root him out. It won't be easy. He's a master of disguise. And undoubtedly he has gone back into hiding until the heat is off. How is he? Unlovable. Has he seen it? No. I thought (..)1975 The Return of the Pink Panther