un·der·run /-ˈrʌn/
  (v.)從..下麵通過;跑過下麵
  underrun
  欠載運行; 底面通過
  underrun
  欠載運行
  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.
  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.
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