cusp
[noun]
Synonyms: point, apex, tip

[TahlilGaran] English Synonym Dictionary ▲

cusp /kʌsp/ noun
[Date: 1500-1600; Language: Latin; Origin: cuspis 'point']

1. [countable] technical the point formed where two curves join

2. be on the cusp of something [singular] to be at the time when a situation or state is going to change:
The country was on the cusp of economic expansion.

3. on the cusp someone who was born on the cusp was born near the time when one star sign ends and another begins

[TahlilGaran] Dictionary of Contemporary English ▲