shake one's head

verb2

1. •
   To move one's head from side to side, in a repeated swiveling motion from the neck, to indicate disagreement, negation, disbelief, disapproval or dismay.

   • She was shaking her head no.
2. •
   To move one's head up and down, in a repeated hinge-like motion from the top of the spine, to indicate agreement, affirmation, approval, or simply polite attentiveness.

   • She listened with care, shaking her head in agreement from time to time. — 2005