1) Chinese invention 2) Hand tool 3) Opportunist 4) Self-seeker 
A backscratcher (occasionally known as a scratch-back) is a tool used, as the name would suggest, for relieving areas that cannot easily be reached just by one`s own hands, typically the back. == Composition and variation == They are generally long slender rod-shaped tools good for scratching one`s back, with a knob on one end for holding and a .....
[n] - someone who is willing to trade favors or services for mutual advantage 2. [n] - a long-handled scratcher for scratching your back
An aerial trick in which a skier drops the tips and lifts the backs of their skis, sometimes to the point of touching their back.
noun a long-handled scratcher for scratching your back
The skier touches his back with the tails of both skis, legs together with his knees bent underneath his body and skis parallel.