Definitions of quiver:

• noun:   case for holding arrows
• noun:   the act of vibrating
• noun:   an almost pleasurable sensation of fright
• noun:   a shaky motion
• verb:   shake with fast, tremulous movements
• verb:   move with or as if with a regular alternating motion
• verb:   move back and forth very rapidly
• name:  A surname (very rare: popularity rank in the U.S.: #79451)