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fault line

noun, Geology.
the intersection of a fault with the surface of the earth or other plane of reference.
Origin of fault line
First recorded in 1865-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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  • "The fault line I mentioned is so obvious you can't miss it," he said to Joyce.

    Cubs of the Wolf Raymond F. Jones
British Dictionary definitions for fault line

fault line

(geology) Also called fault plane. the surface of a fault fracture along which the rocks have been displaced
a potentially disruptive division or area of contention: Europe remains the main fault line in the Tory Party
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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