treble - definition and synonyms

verb [intransitive/transitive] 

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/ˈtreb(ə)l/
present tense
I/you/we/theytreble
he/she/ittrebles
present participletrebling
past tensetrebled
past participletrebled
  1. if something trebles, or if you treble it, it becomes three times bigger than it was before