名詞 quadruple:

1. a set of four similar things considered as a unit
   同義詞：quartet, quartette, quadruplet
2. a quantity that is four times as great as another

動詞 quadruple:

1. increase fourfold

形容詞 quadruple:

1. having four units or components
   同義詞：quadruplicate, quadruplex, fourfold, four-fold
2. four times as great or many
   同義詞：fourfold, four-fold

1. Their profits have quadrupled/They have quadrupled their profits in ten years.
   他們的利潤十年中增長至四倍[他們使利潤在十年中增長至四倍]。

quad.ru.ple

adj.（形容詞）
Having four parts or members.
四部分：有四部分或四個成員的
Multiplied by four; fourfold.
四倍的：被四乘的；四倍的
Music Having four beats to the measure.
【音樂】 四節(jié)拍的
n.（名詞）
A number four times as great as another.
四倍量：是另一個四倍的數(shù)量
v.tr.intr.（及物動詞和不及物動詞）
quad.ru.pled,quad.ru.pling,quad.ru.ples
To multiply or be multiplied by four:
使乘四或被四乘：
例句：
quadrupled the order; quadrupled in size.
定單的四倍；原尺寸的四倍

來源：
From Middle English quadriple [fourfold amount]
源自 中古英語 quadriple [四倍的數(shù)量]
quadruple [tooth with four roots]
quadruple [有四個根的牙齒]
both from Old French quadruple
都源自 古法語 quadruple
from Latin quadruplum [from neuter of] quadruplus [fourfold]
源自 拉丁語 quadruplum [] 源自quadruplus的中性詞 [四重的]
quadru-, quadri- [quadri-]
quadru-, quadri- [表示.四倍，第四.]
-plus [-fold] * see pel- 2
-plus [表示.…倍的.] *參見 pel- 2

【引伸】
quadru.ply
adv.（副詞）