underrun: Meaning and Definition of

un•der•run

1. to run, pass, or go under.
2. 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.