Synonyms for Treble:

adj.

high (adjective)
high-pitched, shrilly, acute, piercing, shrill, soprano, shrieky, strident, penetrating, piping.
three (adjective)
ternary.
triple (adjective)
triple.

n.

increase, raise, go up, go through the roof, add to, escalate, step up, soar, multiply. dozen, Its, determiner, an, every, My, mine, certain. control, pause, console, knob, panel, release, master switch, fast forward, dial, lever. attribute (noun)
soprano.
treble (noun)
dual, ternary, double, high-pitched, soprano, threefold, twofold, triple, high, multiple.

Other synonyms:

piping, shrieky, shrilly.

Usage examples for treble

  1. He advertised boldly the first day: " Infant children at treble price." – The-Brick-Moon-and-Other-Stories by Hale, Edward Everett