A sharp point or pointed end. / (figuratively) An important moment when a decision is made that will determine future events.

(slang) To behave in a reckless or dangerous manner.

plural of cusp

Having a cusp; pointed.

(architecture) A formation of cusps.

present participle of cusp

plural of cuspis

plural of cusping

(idiomatic) on the point of a significant transformation, ascendance, etc.

plural of cusp form