plummeted is a form of:

Plummet



verb
1.
(បច្ចេកទេស) ធ្លាក់ចុះ
ENGLISH MEANING
noun
1.
A piece of lead attached to a line, used in sounding the depth of water.
2.
A plumb bob or a plumb line.
3.
Hence, any weight.
4.
A piece of lead formerly used by school children to rule paper for writing.