underrunning

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.

noun

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