Simple past tense and past participle of treble.(verb)
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Use "trebled" in a sentence
"That capital was "trebled" in 1690, making the nominal capital 31,500_l_.; in August, 1720, it was proposed to augment the cash capital, and to make the nominal total"
"The sort of insecurity that would force you to always say "trebled" instead of "tripled" could only come from a communications major with massive status anxiety, like Keith."
"Even in the era of easy credit, the proportion of those under 35 on low-to-middle incomes owning their own home halved, while those renting often inadequate housing in the private sector trebled."