adjective / verb / noun
treble
TREB-ul/trˈɛbʌl/
A quantity or accomplishment of threefold extent.
The basket contains treble the quantity represented by the single apple beside it.

Etymology
The pieces mean “threefold”: either an amount taken three times or a whole composed of three parts. Treble and triple express the same inherited idea.
In context
O, treble woe Fall ten times treble on that cursed head,
More examples
- Sales trebled after the store began offering free delivery.
- We need to treble production to meet the new demand.
- The team celebrates a treble after winning three titles this season.
Forms
treble · trebles · trebled · trebling
Similar words
- triple
- Triple is more common in everyday American English.
- threefold
- Threefold describes a three-times amount but cannot function as a verb.