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See sounding line.
[From the use of lead weights for making soundings.]
(Nautical Terms) nautical a length of line for swinging a lead, marked at various points to indicate multiples of fathoms
a line by which a lead is lowered into the water to take soundings.
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|Noun||1.||lead line - (nautical) plumb line for determining depth|
plumb line, perpendicular - 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
sounding lead - a metal bob at the end of a sounding line