down

down  1. adj. Not operating.  "The up escalator is down"
   is considered a humorous thing to say, and "The elevator is down"
   always means "The elevator isn't working" and never refers to
   what floor the elevator is on.  With respect to computers, this
   term has passed into the mainstream; the extension to other kinds
   of machine is still hackish.  2. `go down' vi. To stop
   functioning; usually said of the {system}.  The message from the
   {console} that every hacker hates to hear from the operator is
   "System going down in 5 minutes".  3. `take down', `bring
   down' vt. To deactivate purposely, usually for repair work or
   {PM}.  "I'm taking the system down to work on that bug in the
   tape drive."  Occasionally one hears the word `down' by itself
   used as a verb in this vt. sense.  See {crash}; oppose {up}.