What is what does cusp means?

In astrology, a cusp refers to the point at which one astrological sign ends and another begins. For example, if someone is born on the 20th of June, they may be considered to be on the cusp of Gemini (which ends on the 20th) and Cancer (which begins on the 21st). Being on the cusp may result in a blend of the traits of both signs, and is often associated with being adaptable and versatile. However, some astrologers do not give much significance to cusps, arguing that everyone has elements of all the signs in their chart.