Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: cuspis 'point'

cusp

noun
     
cusp
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

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

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