qua·dru·ple /kwɑˈdrupəl, ˈdrʌ; ˈkwɑdrə-/
  (a.)四倍的,四重的,四部組成的四倍數(vt.)使成四倍(vi.)成為四倍
  quadruple
  四倍; 四元的; 四元組
  quadruple
  四元 四倍
  Quad·ru·ple a.  Fourfold; as, to make quadruple restitution; a quadruple alliance.
  Quadruple time Mus., that in which each measure is divided into four equal parts.
  Quad·ru·ple, n.  four times the sum or number; a fourfold amount; as, to receive to quadruple of the amount in damages.
  Quad·ru·ple, v. t. [imp. & p. p. Quadrupled p. pr. & vb. n. Quadrupling ]  To multiply by four; to increase fourfold; to double; to double twice.
  Quad·ru·ple, v. i. To be multiplied by four; to increase fourfold; to become four times as much.
  ◄ ►
  quadruple
       adj 1: having four units or components; "quadruple rhythm has four
              beats per measure"; "quadruplex wire" [syn: quadruplicate,
               quadruplex, fourfold]
       2: four times as great or many; "a fourfold increase in the
          dosage" [syn: fourfold]
       n : a quantity that is four times as great as another
       v : increase fourfold; "His stock earning quadrupled"