noun
denial of service attack; DoS attack
Technical computing term for an attack that makes a service unavailable to its intended users.
そのサイトはサービス不能攻撃を受けてダウンした。
The site went down due to a denial of service attack.
Compound of サービス (service), 不能 (impossible, unable), and 攻撃 (attack), calqued from English 'denial of service attack'.