lead line

Noun
  1. (nautical) plumb line for determining depth (synset 103657273)
    referred to in: navigation, sailing, seafaring - the work of a sailor
    is a type of: perpendicular, plumb line - a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point
    has: sounding lead - a metal bob at the end of a sounding line
    same as: sounding line

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