noun
underground website; unofficial site; shadow site
Often refers to a website that operates outside official channels, containing critical, leaked, or unverified information. Frequently associated with school-related gossip or corporate exposés. Compare with 闇サイト, which implies illegal or deeply hidden activities.
その学校の裏サイトには、教師への誹謗中傷が書き込まれていた。
On that school's underground website, slanderous comments about teachers had been posted.
企業の裏サイトで内部告発が行われた。
Whistleblowing took place on the company's unofficial site.