treble

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. 使增加兩倍; 增加兩倍[英國英語]

They will have to pay much more when rents treble in January. 房租1月份時將增加兩倍，他們得付多得多的錢。

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[英國英語] [正式]

The mine reportedly had an accident rate treble the national average. 據報道，那個鑛的事故發生率是全國平均水平的三倍。

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. (立躰聲音響或收音機的) 高音; 高音調節鏇鈕