"to multiply by three," early 14c., from Old French trebler, from treble "triple" (see treble (adj.)). Related: Trebled; trebling.
I recollect once talking with one of the first men in America, who was narrating to me the advantages which might have accrued to him if he had followed up a certain speculation, when he said, "Sir, if I had done so, I should not only have doubled and trebled, but I should have fourbled and fivebled my money." [Capt. Marryat, "A Diary in America," 1839]
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