\Un`der*run"\, v. t.
{To underrun a hose} (Naut.), to lift it up at one end, then
   walk along shifting one hand after another so that the
   water will run out. Underslung \Un"der*slung`\, Underhung

\Un`der*run"\, v. t.
To run or pass under; especially (Naut.), to pass along and
under, as a cable, for the purpose of taking it in, or of
examining it.
Note: The cable passes over the bows and stern of the boat
      used, while the men haul the boat along by pulling upon
      the cable. --Totten.
{To underrun a tackle} (Naut.), to separate its parts and put
   them in order.