资料来源 : Webster's Revised Unabridged Dictionary (1913)

Running \Run"ning\, a.
   1. Moving or advancing by running. Specifically, of a horse;
      (a) Having a running gait; not a trotter or pacer.
      (b) trained and kept for running races; as, a running
          horse. --Law.

   2. Successive; one following the other without break or
      intervention; -- said of periods of time; as, to be away
      two days running; to sow land two years running.

   3. Flowing; easy; cursive; as, a running hand.

   4. Continuous; keeping along step by step; as, he stated the
      facts with a running explanation. ``A running conquest.''
      --Milton.

            What are art and science if not a running commentary
            on Nature?                            --Hare.

   5. (Bot.) Extending by a slender climbing or trailing stem;
      as, a running vine.

   6. (Med.) Discharging pus; as, a running sore.

   {Running block} (Mech.), a block in an arrangement of pulleys
      which rises or sinks with the weight which is raised or
      lowered.

   {Running board}, a narrow platform extending along the side
      of a locomotive.

资料来源 : WordNet®

running board
     n : a narrow footboard serving as a step beneath the doors of
         some old cars