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to underrun a tackle
From The Collaborative International Dictionary of English v.0.48:
Underrun \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. [1913 Webster] 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. [1913 Webster] 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. To underrun a tackle (Naut.), to separate its parts and put them in order. [1913 Webster]