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Added 10 October 2026

cusp

/kʌsp/ noun

Latin root: cuspis Wiktionary

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about cusp at Wordnik → Where our words come from →

A sharp point or pointed end.
An important moment when a decision is made that will determine future events.
A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.

verb

To behave in a reckless or dangerous manner.

Origin

From Latin cuspis (“a point, spear, pointed end”); first used in astrology. Doublet of cuspid and cuspis.

From Wiktionary, via Kaikki.org (CC BY-SA)

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