Shutdown

Noun

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."

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. An autistic response to stress or sensory overload, in which the individual freezes up and becomes silent, motionless, and unresponsive.
4. A defensive ploy that prevents the opposing players from attacking.
5. A big success; a hyped atmosphere.