quiv·er 1 
(kwĭvər)
(kwĭvər)intr.v. quiv·ered, quiv·er·ing, quiv·ers
1. To shake with a slight, rapid, tremulous movement.
2. To tremble, as from cold or strong emotion. See Synonyms at shake.
n.
The act or motion of quivering.
[Middle English quiveren, perhaps from quiver, nimble (from Old English cwifer-; see gwei- in the Appendix of Indo-European roots).]
quiver·ing·ly adv.
quiver·y adj.