/un'deuhr run"/ , v. , underran, underrun, underrunning , n.
v.t.
1. to run, pass, or go under.
2. Naut. to pass beneath (a stretched rope, net, etc.) in a boat or the like for the purpose of inspection or repairs.
n.
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.
[ 1540-50; UNDER- + RUN ]