SmallO@NearSfhead-PalmBack Release

Production

 * Release the index finger from the thumb, extending it fully to the following posture.
 * Optionally close the index finger back to the thumb and release it again.
 * Release the index finger from the thumb, extending it fully to the following posture.
 * Optionally close the index finger back to the thumb and release it again.
 * Optionally close the index finger back to the thumb and release it again.

Verb

 * 1) to understand

Etymology 2
Shaking the head “no” while producing the sign (above).

Production

 * Release the index finger from the thumb, extending it fully to the following posture.
 * Optionally close the index finger back under the thumb and release again.
 * Release the index finger from the thumb, extending it fully to the following posture.
 * Optionally close the index finger back under the thumb and release again.
 * Optionally close the index finger back under the thumb and release again.

Verb

 * 1) not to understand