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.
(..) Great, Marty. As soon as I reload the fusion generator we'll meet on the roof of the school gym. MARTY: On the roof. -. LACKEY: It's him! THUG: He's in disguise. Guys, what's that? LACKEY: Come on! Let's get him! DOC: Damn! SINGER: All right! Let's do another. LACKEY: Where did he go? (..)1989 Back to the Future Part II
(..) Right on the tick. DOC: Amazing. Absolutely amazing. Too bad the post office isn't as efficient as the weather service. DOC: Excuse the disguise, but I was afraid you wouldn't recognize me. I went to a rejuvenation clinic and got a whole natural overhaul. ...added or years to my life. (..)1989 Back to the Future Part II