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/suÂ·piÂ·naÂ·tion/ (sooâ³pÄ­-naÂ´shun) [L. supinatio ] the act of assuming the supine position, or the state of being supine. Applied to the hand, the act of turning the palm forward (anteriorly) or upward, performed by lateral rotation of the forearm. Applied to the foot, it generally implies movements resulting in raising of the medial margin of the foot, hence of the longitudinal arch.
For example,when a stone tied to one end of a string is rotated in a circle,centripetal force F1 is applied on the stone by the hand in inward direction.In turn, the hand is pulled outwards by centrifugal force F2,acting on it,due to tendency of the stone to regain its natural straight line path.