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

Example

His personality falls on the cusp between introversion and extroversion.

Their relationship is on the cusp between friendship and romance.

She celebrates her birthday on the cusp between Pisces and Aries.

The weather is on the cusp between summer and autumn, with warm days and cool evenings.

She was on the cusp of a new chapter in her life.

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