Fault-line definition

Any division or rift, as based on philosophical, religious, or ethnic differences, that is perceived as leading inevitably to violent confrontation.
noun
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(geol.) The line formed along the surface of the ground by a fault.
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The definition of a fault line is a break or fracture in the ground that occurs when the Earth's tectonic plates move or shift and are areas where earthquakes are likely to occur.

A break where the Earth's tectonic plates shifted that is a likely site of an earthquake is an example of a fault line.

noun
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(geology) The line formed by the intersection of the plane of a fault with the surface of the Earth.
noun
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(by extension) A minor split (in public opinion etc) that may develop into something larger.
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Alternative spelling of fault line.
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Other Word Forms

Noun

Singular:
fault-line
Plural:
fault-lines