To cover a chair or sofa with soft padding and cloth or leather — the fabric layer plus the springs, foam, or stuffing underneath it. This is the craft word for what makes a soft chair soft. "They upholstered the armchair in green velvet." "We're having the sofa upholstered again." You meet it most as a past participle, upholstered, used as a description: an upholstered chair (one with a padded fabric seat and back, not a bare wooden one), a room upholstered in silk. Shops and furniture catalogues use it constantly; so do people restoring old furniture, since re-covering a worn-out sofa instead of throwing it away is common. In ordinary conversation many people just say "cover" or "redo" — "we're getting the sofa redone" — and keep upholster for when they want to be precise. It is a regular verb: upholster, upholsters, upholstered, upholstering. The noun for the material and the work is upholstery. One small extra: people occasionally use it as a joke about a person's clothes or body — "a well-upholstered gentleman" means comfortably padded, a gentle way of saying plump. It is old-fashioned and affectionate, not something to say to someone's face.

（為沙發、椅子）包覆軟墊布料、做椅面／換椅面