The difference between Plumb line and Plummet
When used as nouns, plumb line means a cord with a weight attached, used to produce a vertical line, whereas plummet means a piece of lead attached to a line, used in sounding the depth of water, a plumb bob or a plumb line.
Plummet is also verb with the meaning: to drop swiftly, in a direct manner.
check bellow for the other definitions of Plumb line and Plummet
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Plumb line as a noun:
A cord with a weight attached, used to produce a vertical line; a plummet.
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Plumb line as a noun:
Any vertical reference line.
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Plummet as a noun (archaic):
A piece of lead attached to a line, used in sounding the depth of water, a plumb bob or a plumb line
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Plummet as a noun (archaic):
Hence, any weight
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Plummet as a noun (archaic):
A piece of lead formerly used by school children to rule paper for writing (that is, to mark with rules, with lines)
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Plummet as a noun:
A plummet line, a line with a plummet; a sounding line
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Plummet as a noun:
Violent or dramatic fall
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Plummet as a noun (figuratively):
A decline; a fall; a drop
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Plummet as a verb (intransitive):
To drop swiftly, in a direct manner; to fall quickly.
Examples:
"After its ascent, the arrow plummeted to earth."