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up +‎ stair +‎ -s



upstairs (comparative further upstairs, superlative furthest upstairs)

  1. Located on a higher floor or level of a building.
    They can sleep in the upstairs bedroom.
  2. (baseball, informal) Pertaining to a pitched ball that is high, and usually outside the strike zone.
    That fastball was upstairs for a ball.



upstairs (comparative further upstairs, superlative furthest upstairs)

  1. Up the stairs; on a higher floor or level.
    I'll take my shoes and put them away the next time I go upstairs.
    I hate the people who live upstairs, and I especially hate their piano.
    • 1891, Thomas Hardy, Tess of the d’Urbervilles , chapter IV
      In a large bedroom upstairs, the window of which was thickly curtained with a great woollen shawl lately discarded by the landlady, Mrs Rolliver, were gathered on this evening nearly a dozen persons.
  2. (informal) In the brain or mind.
    After Joe did a hula dance on the kitchen table, his friends wondered if he didn't have a lot going on upstairs.
  3. (informal) In heaven, especially with regard to where a deity might be found.




upstairs (plural upstairs)

  1. An upper storey.