Cusp | Mean of cusp in English Dictionary

/ˈkʌsp/

• Noun
• a pointed end or part where two curves meet
1. the cusp of a tooth
• at the point when something is about to change to something else
1. She is on the cusp [=on the verge] of being a star.
2. on the cusp between childhood and adolescence
3. I was born on the cusp between Leo and Virgo.