backscratching

n.

互开方便之门，互相利用（常指从事非法活动）；

Literary backscratching
Backscratching in Hierarchical Organizations
The Art of Backscratching in Chicago
On Iran, try backscratching, not blackmail
"Backscratching"alternative to PRSI pattern recognition
Reciprocity: The Hazards of Backscratching
Book Reviews : A backsliding, backscratching élite
Backscratching. (testimony by Richard Schifter and Bruce Rappaport) (Beat the Devil) (column)
Pricing Favors: Some Evidence on the Efficiency of Backscratching
Super Bowl motto: In money we trust The point is, everything revolves around backscratching deals, money hunts and what's selling now.