- upstairs
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adv.1. up the stairs; to or on an upper floor.2. Informal. in the mind: to be a little weak upstairs.3. to or at a higher level of authority: You may have to take the matter upstairs.4. Mil. Slang. at or to a higher level in the air.5. kick upstairs, to promote (a person) to a higher position, usually having less authority, in order to be rid of him or her.adj.6. Also, upstair. of, pertaining to, or situated on an upper floor: an upstairs window; an upstairs apartment.n.7. (usually used with a sing. v.) an upper story or stories; the part of a building or house that is above the ground floor: The upstairs of this house is entirely rented.8. a higher command or level of authority: We can't take action till we have approval from upstairs.[1590-1600; UP- + STAIRS]
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Universalium. 2010.