A Plummet

1. (archaic) A piece of lead attached to a line, used in sounding the depth of water, a plumb bob or a plumb line
2. (archaic) Hence, any weight
3. (archaic) A piece of lead formerly used by school children to rule paper for writing (that is, to mark with rules, with lines)
4. A plummet line, a line with a plummet; a sounding line
5. Violent or dramatic fall
6. (figuratively) A decline; a fall; a drop