From Longman Dictionary of Contemporary Englishclose down phrasal verb1 close something ↔ downSHUT/CLOSE if a company, shop etc closes down or is closed down, it stops operating permanently Paramount closed down its London office in 1968.2 British EnglishAMT to stop broadcasting radio or television programmes at the end of the day BBC 2 closes down at 12.45 tonight. → close→ See Verb table
Examples from the Corpus
close down• If the factory closes down, 600 people will lose their jobs.• Not long ago, the orchestra was the pride of the city. Now it is on the verge of closing down.• Coal mines are closing down all over the country. 