running start

noun
1.
Sports. a start, as in the hop, step, and jump or the running broad jump, in which a contestant begins moving before reaching the starting or take-off point.
2.
an initial advantage in undertaking something; a head start: His background gave him a running start in business.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Idioms & Phrases

running start

An initial advantage, as in His background in biochemistry gave him a running start in the field of genetics. This expression alludes to track events such as the running broad jump, in which one begins moving before reaching the actual take-off point. [1920s] Also see under get off the ground.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Griffin doesn't need a running start to go grab rebounds, nor a dribble or two
  to dunk from close range.
The heavy body and set back and apart legs require the pochard to get a running
  start on the water before flight.
Making a running start to move a heavy stationary load can stress a nylon tow
  rope or steel cable to the breaking point.
When faced with danger the birds get a running start, then take turns taking
  wing.
Idioms & Phrases
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