treble /ˈtrɛbəl/ TEM4 ( trebling, trebled, trebles )

• 1. 

  V-T/V-I If something trebles or if you treble it, it becomes three times greater in number or amount than it was. 使增加两倍; 增加两倍 [英国英语]

  例：

  They will have to pay much more when rents treble in January.

  房租1月份时将增加两倍，他们得付多得多的钱。

• 2. 

  PREDET If one thing is treble the size or amount of another thing, it is three times greater in size or amount. 3倍的 [英国英语] [正式]

  例：

  The mine reportedly had an accident rate treble the national average.

  据报道，那个矿的事故发生率是全国平均水平的三倍。

• 3. 

  N-COUNT On a stereo system or radio, the treble is the ability to reproduce the higher musical notes. The treble is also the knob which controls this. (立体声音响或收音机的) 高音; 高音调节旋钮