from Volcar - to tip-over or capsize;

242429850_eee998196c_m.jpg flickr (

a falling step: The leader causes the follower to tilt or lean forward and fall off her axis before he catches her again. The process produces a beautiful leg drop from her. The movement requires the support of a close embrace.

from (

In a close embrace, one leads the woman to "fall / lean" on you, through going backwards, so she capsizes off her axis, leans and drops her knee, making circles with the foot.

from Tango-E-Vita (