noun

1. A piece of lead attached to a line, used in sounding the depth of water, a plumb bob or a plumb line

2. Hence, any weight

3. A piece of lead formerly used by school children to rule paper for writing (that is, to mark with rules, with lines)

verb

1. To drop swiftly, in a direct manner; to fall quickly.

   “After its ascent, the arrow plummeted to earth.”

Synonyms: dive, drop, fall