Shut Down Meaning

(idiomatic) To turn off or stop.

Example:   They are planning to shut down the entire building at the end of the month.
2010, Jonathan Ashcroft, Scavengers (page 41)
  Alex quickly shut down her argument. 'But I'm the male. They lead in dancing, why shouldn't I be the lead here too? And besides, I was picked, you applied, which basically means I'm the lead anyway. […]
  It's a good idea to shut down the machine before you leave.