cusp
Pronunciation:
/kʌsp/noun
Definitions
A sharp point or pointed end.
An important moment when a decision is made that will determine future events.
A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.
A point made by the intersection of two curved lines or curved structures, a common motif in Gothic architecture.
verb
Definitions
To behave in a reckless or dangerous manner.