free-running

English

Adjective

free-running (comparative freer running, superlative freest running)

  1. (of a mechanism) Moving freely and smoothly.
    • 1961 November, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, page 684:
      It is the Bulleid Pacifics of the Southern Region, which all observers of locomotive performance know to be among the freest running engines in the country.

References

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