cusp

1. A sharp point or pointed end.

   Spitze

   пикpik, остриёostrijó, ко́нчикkónčik

   пікpik, ві́стряvístrja

2. (переносно)An important moment when a decision is made that will determine future events.

   Scheitelpunkt, Wendepunkt

3. 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.

4. A point made by the intersection of two curved lines or curved structures, a common motif in Gothic architecture.

   point formed by two intersecting arcs (as from the intrados of a Gothic arch)

5. A boundary between zodiacal signs and houses.

6. Any of the pointed parts of a canine tooth or molar.

7. A flap of a valve of a heart or blood vessel.

   a thin triangular flap of a heart valve

8. A point of transition.

1. We're on the cusp of summer now.

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2. We are on the cusp of a big breakthrough.

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3. We are standing at the cusp of an incredible opportunity.

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4. She was on the cusp of a breakthrough when the fire alarm went off.

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