shutdown

noun5

1. •
   The action of stopping operations; a closing, of a computer, business, event, etc.

   • You need to enter your password at startup, but it's not required at shutdown.
   • There is a plastic molly-guard covering the escalator's shutdown button to prevent little kids from pushing it and stopping the escalator.
2. •
   A statement, insult, etc. that prevents the opponent from replying further.

   • When he insulted me, my reply was such a shutdown that he left the room.
3. •
   A defensive ploy that prevents the opposing players from attacking.
4. •
   An autistic response to stress or sensory overload, in which the individual freezes up and becomes silent, motionless, and unresponsive.

   • I retreated into myself and allowed myself to be swallowed into a typically autistic shutdown. — 2018
5. •
   (UK, slang) A big success; a hyped atmosphere.

   • Fashion week and it's shutdown / Went to the show, sitting in the front row / In a black tracksuit and it's shutdown — 2015