Cusp

/kˈʌsp/

/ˈkəsp/

Cusp

the point or curve formed by the intersection of two arcs or curves, commonly seen in the tracery of Gothic architecture

small elevation on the grinding surface of a tooth

a thin triangular flap of a heart valve

synonyms : leaflet

Examples

1. She is on the cusp of being a star.

2. Our team is on the cusp of making a discovery that could change the face of modern medicine.

3. After being on the cusp for several years, Mark finally broke into mainstream success with his most recent novel.

4. it has cusps.