Slipstream is the tunnel of suction aerorodinamico which generates a car, moped, bicycle or other mechanism when it moves at speed. In other words: a kind of vacuum that breaks the air resistance, allowing who goes back [to slipstream save energy and gain speed, thus, how to get more comfortable in will do if it is bike.] In cycling, it is called commonly known as tailgating.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list