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