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The phrase "have roughly tripled" is correct and usable in written English.
It can be used when discussing an increase in quantity or value that is approximately three times greater than a previous amount.
Example: "Over the past decade, the number of electric vehicles on the road has roughly tripled."
Alternatives: "have approximately tripled" or "have nearly tripled."
Exact(11)
In Afghanistan such attacks have roughly tripled in the past two years.The bombmakers' skills spread rapidly.
Many budget items – both revenue and expenses – have roughly tripled since 2006.
Over the past year, however, U.S. venture capital commitments to Berlin firms have roughly tripled, Mr. Whitmire at Earlybird estimated.
From 1992 to 2010, the two-year budgets passed by Texas lawmakers have roughly tripled in size, to $187.5 billion from $62.8 billion.
As it is, development costs have roughly tripled since 2001, according to industry figures, thanks to a shortage of labour and parts—such as those massive tyres.Meanwhile, the province of Alberta is reviewing the tax regime.
In the last 15 years, foreign investors have roughly tripled their holdings in Canada, controlling about 13,000 corporations, which are worth about $500 billion and responsible for about a third of the country's corporate profits.
Similar(49)
Rental inventory has roughly tripled in three years, she said.
The incidence of ear infections has roughly tripled in the last 25 years.
According to SharesPost, Facebook's value has roughly tripled over the last year, to $42.4 billion.
The world's output of iron ore, for example, has roughly tripled since 2000.
Since Rabbi Levant arrived a year ago, Young Israel's membership has roughly tripled, to 67 people.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com