treble

increase threefold

having three units or components or elements

“a treble row of red beads”

the pitch range of the highest female voice

having more than one decidedly dissimilar aspects or qualities

“every episode has its double and treble meaning”

three times as great or many

“a claim for treble (or triple) damages”

having or denoting a high range

“the boy still had a fine treble voice”

sing treble