Ŭn'der-rŭn', v. t.

v. t. To run or pass under; especially, to pass along and under, as a cable, for the purpose of taking in, or of examining, the condition of 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. Mar. Dict.