/kʌsp/
cusp
BrE /kʌsp/
NAmE /kʌsp/
(specialist)
a pointed end where two curves meet
the cusp of a leaf
the time when one sign of the zodiac ends and the next begins
I was born on the cusp between Virgo and Libra.
(figurative) He was on the cusp between small acting roles and moderate fame.