plum·met /ˈplʌmət/
 鉛錘,鉛錘線(vi.)垂直落下


 Plum·met n.
 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.

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 plummet
      n : the metal bob of a plumb line [syn: plumb bob, plumb]
      v : drop sharply; "The stock market plummeted" [syn: plump]