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| Date: | 1500-1600 |
| Language: | Latin |
| Origin: | cuspis 'point' |
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cusp
1 [countable] technical the point formed where two curves join
2 to be at the time when a situation or state is going to change : 
The country was on the cusp of economic expansion.
be on the cusp of something
[singular]The country was on the cusp of economic expansion.3 someone who was born on the cusp was born near the time when one star sign ends and another begins
