fault line

noun Geology.
the intersection of a fault with the surface of the earth or other plane of reference.

Origin:
1865–70

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World English Dictionary
fault line
 
n
1.  geology Also called: fault plane the surface of a fault fracture along which the rocks have been displaced
2.  a potentially disruptive division or area of contention: Europe remains the main fault line in the Tory Party

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Example sentences
The article says that aftershocks usually occur further along down the same
  fault line.
Seismologists had warned that the dam should not be built because of its
  proximity to a major fault line.
Each party has to learn a lesson here, and their mistakes balance each other
  out, so the fault line stabilizes in the middle.
The drifts follow a major fault line which runs east and west through the
  mountains.
Images for fault line
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