Katakana rendering of 'shutdown'. Refers to stopping or turning off machines or computers (noun) and the action of shutting down (verb). Can also mean temporary closure of organizations or government.
パソコンは作業が終わったら必ずシャットダウンしてください。
Please be sure to shut down the computer when you finish your work.
サーバーの問題で深夜にシャットダウンが行われた。
Due to server issues, a shutdown was carried out late at night.
政府の予算未決で一部機関がシャットダウンした。
Some agencies were shut down due to the government's budget impasse.