verb (used with object), un·der·ran, un·der·run, un·der·run·ning.

to run, pass, or go under.
Nautical. to pass beneath (a stretched rope, net, etc.) in a boat or the like for the purpose of inspection or repairs.


something that runs or passes underneath, as a current.
an instance of costing or spending less than estimated.
a production run of a manufactured or printed item below the quantity ordered.

Origin of underrun

First recorded in 1540–50; under- + run
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for underrun

Historical Examples of underrun

  • "That 'seventeen' white pine is going to underrun," said Dyer.

    The Blazed Trail

    Stewart Edward White

  • The Niagara put back, and the cable was "underrun" the whole distance.

    The Story of the Atlantic Telegraph

    Henry M. (Henry Martyn) Field

  • The snow-white spires of the oncoming ship swayed with solemn and stately motions to the underrun of the quartering sea.

  • In precisely similar manner the horn, and in this case the skin of the coronet, is underrun.

    Diseases of the Horse's Foot

    Harry Caulton Reeks

  • The car had just thundered past another station, and Callahan had underrun one more stop-signal at full speed.

    The Grafters

    Francis Lynde