verb / noun
quiver
KWIV-er/ˈkwɪvər/
A slight, rapid shaking movement.
The tuning fork quivers rapidly while its stem remains clamped in place.

Etymology
Probably related to quaver or an older lively-movement word. The exact formation is uncertain; the arrow-case noun has a separate ancestry.
In context
the spear stuck in his heart, which still beat, and made the butt- end of the spear quiver
More examples
- A slight quiver passes through her lower lip.
- His voice has a noticeable quiver when he speaks.
- My legs quivered with exhaustion after the steep climb.
Forms
quiver · quivers · quivered · quivering