Definition of "darting"

During this period, a different set of abnormal mouth-movements made their appearance: forced protrusions of the lips, propulsion of the tongue, and occasional choreic dartings of the tongue.

1973, Oliver Sacks, Awakenings

Jane Gibson taught the cast the movements of the various creatures they were representing: the linear shufflings of the hedgehogs, the dozy lollopings of the rabbits, the sinuous dartings of the weasel and so on.

2000, Alan Bennett, Writing Home