Е-7

ЕЗДИТЬ ВЕРХОМ на ком coll, disapprov VP subj: human or collect) to exploit s.o. whom one has subjected to one's will, use a person for one's own ends, make s.o. do what one wants

X ездит верхом на Y-e = X pushes (bosses, orders) Y around

X walks all over Y (in limited contexts) X has Y wrapped around X's little finger.