fault line

noun

: something resembling a fault : split, rift
… a major conceptual fault line in foreign policy …Morton Kondracke

Examples of fault line in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
An earthquake starts deep underground when huge tectonic forces cause stress to build up along a fault line, a massive fracture in Earth’s crust where blocks of rock have shifted and moved past each other. Jacek Krywko, Scientific American, 23 Apr. 2026 Grabens are commonly found on Earth, and on Mars they are usually produced when tectonic stresses pull areas of land apart, creating fault lines that cause the land in between to drop down. Keith Cooper, Space.com, 23 Apr. 2026 As Democrats look toward the next election cycle, the question is no longer whether the party is shifting on Israel, but whether that shift will turn one of Washington’s most durable bipartisan issues into a lasting political fault line. Samantha-Jo Roth, The Washington Examiner, 19 Apr. 2026 Seniors account for a disproportionate share of losses The report shows a clear fault line by age. Kurt Knutsson, FOXNews.com, 12 Apr. 2026 See All Example Sentences for fault line

Word History

First Known Use

1869, in the meaning defined above

Time Traveler
The first known use of fault line was in 1869

Browse Nearby Words

Cite this Entry

“Fault line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fault%20line. Accessed 2 May. 2026.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster