Looking around - reference to this phrase in dance seems to refer to the dancer's hands dropping and raising.

Also "YouTube - How to belly dance hip lifts/drops" seems to refer to the dancer.

Vance's Fantastic Tap Dance Dictionary - [ C - E ]

Performed both on stage and in social dancing; the dance has been revived numerous ... the heel drop: With the weight on one foot, the free foot is raised; ...

No more sorry...