0 past simple and past participle of treble --
1 to increase three times in size or amount, or to make something do this: --
In the iron and steel trades unemployment has trebled since they came into office, and in engineering it has nearly trebled.
I think it has probably trebled, but certainly it has more than doubled, because it has doubled since about 1914.
If that is to be achieved, the upper value limit of £500 should be at least doubled, and perhaps even trebled.
The number of individual shareholders has more than trebled since 1979.
But it is generally accepted that the number of individual share owners has approximately trebled since 1979.
The number of families forced to rely on family income supplement to top up their low wages has trebled since 1979.
No fees need be trebled in one year.
Now that programme is to be virtually trebled.
