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.


  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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