1
: a sharp wedge of steel or other hard material used as a fulcrum for a lever beam in a precision instrument
2
: a sharp narrow knifelike edge

Examples of knife-edge 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.
Forbidden Peak, North Cascades National Park, WA — West Ridge One of the 50 Classic Climbs of North America, this is rock climbing on a knife-edge ridge in a wild and breathtaking alpine setting. Sean McNally, Outdoor Life, 13 Mar. 2025 There are many more in districts that Donald Trump won by a knife-edge margin. Raja Krishnamoorthi, Newsweek, 13 Mar. 2025

Word History

First Known Use

1818, in the meaning defined at sense 1

Time Traveler
The first known use of knife-edge was in 1818

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Cite this Entry

“Knife-edge.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/knife-edge. Accessed 16 Mar. 2025.

Kids Definition

knife-edge

noun
ˈnī-ˌfej
: a sharp wedge usually of steel used as a support for a lever beam in a very exact instrument (as a balance)
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