How do you spell Quiver

Available Definitions:
1)  a. - Nimble; active.
2)  v. i. - To shake or move with slight and tremulous motion; to tremble; to quake; to shudder; to shiver.
3)  n. - The act or state of quivering; a tremor.
4)  n. - A case or sheath for arrows to be carried on the person.