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WordNet
running start
  1. n. a racing start in which the contestants are already in full motion when they pass the starting line [syn: flying start]

  2. a quick and auspicious beginning [syn: flying start]

Wikipedia
Running Start

Running Start programs in Washington and Hawaii allow juniors and seniors to attend college courses numbered 100 or above, while completing high school. It is similar to other dual enrollment programs common at public and private colleges and universities in other states.

Usage examples of "running start".

Backing up for a running start, he sprinted forward and hurtled hopeful into the darkness.

If at all possible, I want her several hours away, far enough for us to get the running start we need.