(1):

(v. t.) To furnish (rooms, carriages, bedsteads, chairs, etc.) with hangings, coverings, cushions, etc.; to adorn with furnishings in cloth, velvet, silk, etc.; as, to upholster a couch; to upholster a room with curtains.

(2):

(n.) A broker.

(3):

(n.) An upholsterer.