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.
⇒ 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.
© Webster 1913
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.
© Webster 1913