• synonyms


verb (used with object), un·der·ran, un·der·run, un·der·run·ning.
  1. to run, pass, or go under.
  2. Nautical. to pass beneath (a stretched rope, net, etc.) in a boat or the like for the purpose of inspection or repairs.
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  1. something that runs or passes underneath, as a current.
  2. an instance of costing or spending less than estimated.
  3. a production run of a manufactured or printed item below the quantity ordered.
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Origin of underrun

First recorded in 1540–50; under- + run
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for underrunning

Historical Examples

  • Later Van Depoele invented an underrunning trolley and pole, taking out the original patents.

    Every-day Science: Volume VII. The Conquest of Time and Space

    Henry Smith Williams

  • In place of the underrunning trolley and pole, however, the current was taken from the overhead wire by means of a flexible cable.