shutdown

noun

1. (countable, uncountable)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.”

   “In 1963, there was even more of a shutdown [at Christmas]. The Western and London Midland Regions ran no trains, with the rest of the network having the "barest of skeleton services". The Daily Herald called Beeching's cuts "the most scrooge-like... in railway history".”

2. (countable, uncountable)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. (countable, uncountable)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.”

   “I may even reach the point where I have an autistic shutdown, which means I'll be unable to communicate, interact or socialize.”

   “Their [autistic girls'] distress could come out in all sorts of ways and result in meltdown or shutdown.”

4. (countable, uncountable)A defensive ploy that prevents the opposing players from attacking.
5. (UK, countable, slang, uncountable)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”