ground zero

US /ˌɡraʊnd ˈzɪr.oʊ/
UK /ˌɡraʊnd ˈzɪr.oʊ/
"ground zero" picture
1.

point zéro, épicentre

the point on the earth's surface directly above or below a nuclear explosion or other large bomb

:
The city center was declared ground zero after the bombing.
Le centre-ville a été déclaré point zéro après le bombardement.
Scientists studied the effects of the blast at ground zero.
Les scientifiques ont étudié les effets de l'explosion au point zéro.
2.

Ground Zero, site du World Trade Center

the site of the World Trade Center in New York City, destroyed in the terrorist attacks of September 11, 2001

:
A memorial now stands at Ground Zero in New York City.
Un mémorial se dresse maintenant à Ground Zero à New York.
Many people visit Ground Zero to pay their respects.
Beaucoup de gens visitent Ground Zero pour rendre hommage.
3.

point de départ, niveau le plus bas

the very beginning or most basic level of something

:
We have to go back to ground zero and rethink our entire strategy.
Nous devons revenir au point de départ et repenser toute notre stratégie.
His understanding of the subject is still at ground zero.
Sa compréhension du sujet est encore au point zéro.