(ש"ע) סיבוב לפנים

n. forward rotation of the arm or hand so that the palm faces downward

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Noun
1. rotation of the hands and forearms so that the palms face downward
(antonym) supination
(hypernym) rotation, rotary motion
(derivation) pronate

nf. pronation, forward rotation of the arm or hand so that the palm faces downward

(n.)
The position of the limb resulting from the act of pronation. Opposed to supination.
  

(n.)
The act of turning the palm or palmar surface of the forefoot downward.
  

(n.)
That motion of the forearm whereby the palm or palmar, surface is turned downward.
  

Rotation of the arm or leg inward. In the case of the arm, the palm of the hand will face posteriorly.