Plum·met n.
1. A piece of lead attached to a line, used in sounding the depth of water.
I'll sink him deeper than e'er plummet sounded. --Shak.
2. A plumb bob or a plumb line. See under Plumb, n.
3. Hence, any weight.
4. A piece of lead formerly used by school children to rule paper for writing.
Plummet line, a line with a plummet; a sounding line.
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