- 1to become, or to make something, three times as much or as many synonym triple
- 2 Cases of food poisoning have trebled in the last two years. treble something He trebled his earnings in two years.
NAmE//ˈtrɛbl//[intransitive, transitive]Verb Forms present simple I / you / we / they treble
he / she / it trebles
past simple trebled
-ing form trebling