"a claim for treble (or triple) damages""a threefold increase"
2. having more than one decidedly dissimilar aspects or qualities;
"a double (or dual) role for an actor""the office of a clergyman is twofold; public preaching and private influence"- R.W.Emerson"every episode has its double and treble meaning"-Frederick Harrison
Adverb
1. by a factor of three;
"our rent increased threefold in the past five years"