Does the Word Cusp Mean?

: at the point when something is about to change to something else She is on the cusp of being a star.

What cusp means?

: point, apex: such as. a : a point of transition (as from one historical period to the next) : turning point also : edge, verge on the cusp of stardom … you're on the cusp between heat exhaustion and life-threatening heatstroke. —

What does the root word cusp mean?

cusp (n.) 1580s, in astrology, "first entrance of a house in the calculation of a nativity," from Latin cuspis "point, spear, pointed end, head," which is of unknown origin. Astronomical sense is from 1670s, "point or horn of a crescent." Anatomical sense of "a prominence on the crown of a tooth" is from 1839.