windmill ( synonym found)
Definition of windmill:

(n) : a machine which translates linear motion of wind to rotational motion by means of adjustable vanes called sails; the structure containing such machinery
(v) : to rotate with a sweeping motion; of a rotating part of a machine, to become disengaged and rotate freely
"she ran down the hill, windmilling her arms with glee."
Definition of windmill:

(n) : a machine which translates linear motion of wind to rotational motion by means of adjustable vanes called sails; the structure containing such machinery
(v) : to rotate with a sweeping motion; of a rotating part of a machine, to become disengaged and rotate freely
"she ran down the hill, windmilling her arms with glee."
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