PLUMMETING

Verb

plummeting

present participle of plummet

Noun

plummeting (plural plummetings)

A violent or dramatic fall.

Source: Wiktionary

PLUMMET

Plum"met, n. Etym: [OE. plommet, OF. plommet, fr. plom, plum, lead, F. plomb. See Plumb.]

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.

Source: Webster’s Unabridged Dictionary 1913 Edition