trebled

/T R EH1 B AH0 L D/
verb
  1. 1

    To multiply by three; to make into three parts, layers, or thrice the amount.

  2. 2

    To become multiplied by three or increased threefold.

  3. 3

    To make a shrill or high-pitched noise.

  4. 4

    To utter in a treble key; to whine.

Source: https://en.wiktionary.org/wiki/treble, https://en.wiktionary.org/wiki/trebled