Bhola sa ban ke kaam nikalwata rehta hai, Rahu saat wala gyan chhupata aur paisa udata rehta hai.
Acting innocent, he keeps getting his work done; the one with Rahu in the 7th hides his knowledge and keeps blowing money.
The 7th house is the house of partnerships, business, and public dealing. Rahu is the master of disguise and manipulation.
When Rahu sits in the 7th house, the person becomes a brilliant social actor. They will pretend to be completely innocent, naive, or even foolish ("bhola sa ban ke"). People will underestimate them and help them out. But behind that innocent face is a sharp, calculating mind getting exactly what it wants.
Furthermore, they will never reveal their true knowledge or strategies ("gyan chhupata"), but they will spend money lavishly ("paisa udata") to maintain their public image.