"upright" = "highest"

[Mark Mandel]

Letter from the office building management:

To all Tenants:
  Good Morning!
  Please be advised that the interior window cleaning will take place on
Friday, June 18^th .
  Please remove all items from the windowsills and ledges and ***have your
blinds in the upright position.***
  Thank you for your cooperation.
  Have a nice day!

m a m

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The American Dialect Society - http://www.americandialect.org