noun
Refers to the point on the ground directly below a nuclear explosion, or by extension the site of a major disaster or attack. Often used in news and historical contexts.
広島のグラウンドゼロには平和記念公園が造られた。
Peace Memorial Park was built at ground zero in Hiroshima.
テロ攻撃
The ground zero of the terrorist attack was off-limits for a long time.