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slip·stream (slĭṕstrēḿ)

noun 

  1. The turbulent flow of air driven backward by the propeller or propellers of an aircraft. Also called race2
  2. The area of reduced pressure or forward suction produced by and immediately behind a fast-moving object as it moves through air or water.

intransitive verb: -streamed, -stream·ing, -streams. 

To drive or cycle in the slipstream of a vehicle ahead.