| adv. | 1. | Up the stairs; in or toward an upper story. |
| a. | 1. | Being above stairs; |
| Adj. | 1. | upstairs - on or of upper floors of a building; "the upstairs maid"; "an upstairs room" Synonyms: upstair Antonyms: downstair, downstairs - on or of lower floors of a building; "the downstairs (or downstair) phone" |
| Adv. | 1. | upstairs - on a floor above; "they lived upstairs" Synonyms: on a higher floor, up the stairs Antonyms: down the stairs, downstairs, on a lower floor, below - on a floor below; "the tenants live downstairs" |
| 2. | upstairs - with respect to the mind; "she's a bit weak upstairs" Synonyms: in the head, in the mind |