noun
tremolo
TREM-uh-loh/ˈtremələʊ/
A rapid wavering or pulsing effect in a musical sound.
The violinist uses tremolo to give the music a shivering quality.

Etymology
The image of trembling became a description of musical sound: rapid repetition or variation makes a tone seem to quiver, giving tremolo its characteristic wavering effect.
In context
starting here in the double reeds let's jump back a little bit and talk about some of the supporting characters I really love this right down here the triplet measured tremolo here
More examples
- The guitar's tremolo makes each chord pulse in volume.
- Rapid bow strokes create a soft tremolo on the violin.
- The strings' dramatic tremolos heighten the tension.
Forms
tremolo · tremolos