trebling
treb-ling
verb
Making something three times larger in amount, size, or number.
"The firm is trebling its output."
noun
The act or process of increasing something to three times its original size.
"The trebling of costs was unexpected."
Thesaurus
Synonyms: treble, multiple, triple, three-fold, threefold, ternary, triplex, high-pitched, high, soprano, dual, two-fold