Wing Beating

A descriptive term for the rhythmic oscillating tremor of the upper extremities as they are outstretched, a characteristic sign of Wilson’s disease, often accompanied by cerebellar ataxia and intention tremor
References in periodicals archive ?
The banking regulators haven't a clue as to what the domino effect would be; it is a take on chaos theory and the usual clich of a butterfly's wing beating in the Amazon causing a hurricane in the Caribbean.
I remember Right Wing beating us at Ascot two years ago, but I think this will a very interesting and competitive race.
He saw the gander in the pond below him, his dark head held high and his free wing beating the water, calling as he had never heard him call before.