ground zero
1 ENTRIES FOUND:
ground zero
noun
ground zero
noun
Britannica Dictionary definition of GROUND ZERO
[noncount]
1
:
the point on the earth's surface directly above, below, or at which an explosion (especially a nuclear explosion) occurs
2
:
the central point in an area of fast change or intense activity
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ground zero in the battle over immigration laws
3
:
the beginning state or starting point
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We're going to have to go right back to ground zero [=square one] and start all over again.
