stop (gesture)
A hand gesture in which one or both hands are fully open, with the arm(s) outstretched in front of the body, and the wrist(s) bent back at a 90 degree angle so that the fingers point upwards.
This gesture can be used to tell someone to literally stop moving forward and not come any closer to the person performing the gesture, or more figuratively to tell someone to stop doing some other action.
