IPA: /ˈtrɛbli/
KK: /ˈtrɛbli/
Describing something that has high-pitched qualities or sounds, often associated with a musical tone that is bright and sharp.
The singer's voice was trebly, making it stand out in the choir.
In a way that is three times as much or to three times the degree.
The price increased trebly after the new tax was introduced.
Trebly is formed from "treble" (from Old French *treble*, meaning threefold or triple) and the suffix "-ly" (meaning in a manner of). The word "trebly" means in a manner that is threefold or triple.
Think of something that is 'threefold' ('treble') and how it is done 'in a manner' ('-ly'). This helps you remember that 'trebly' means in a threefold manner.