We found one dictionary that defines the word fast running:

General (1 matching dictionary)

1. fast-running: Wordnik

Phrases: fast running water, fast breathing after running, fast running horse, more... ▸ Words similar to fast running ▸ Usage examples for fast running ▸ Idioms related to fast running ▸ Wikipedia articles (New!) ▸ Words that often appear near fast running ▸ Rhymes of fast running ▸ Invented words related to fast running