fault-line

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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