[1] : The Collaborative International Dictionary of English v.0.48

treble \tre"ble\, v. t. imp.  p. p. trebled; p. pr.  vb. n.
   trebling.
   1. to make thrice as much; to make threefold. "love trebled
      life." --tennyson.
      1913 webster

   2. to utter in a treble key; to whine. obs.
      1913 webster

            he outrageously
            when i accused him trebled his reply. --chapman.
      1913 webster
see also:
trebled trebling 

Trebled >> T Words
Trebled, definition of term: Trebled
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