To change the direction or course of
To prohibit from occurring by advance planning or action
To turn away
See syn. study at
She didn't avert her gaze this time.
But though he was unable to extract the best results from parliament he was always able to avert its worst excesses.
One of the chief purposes for which magic was employed was ~o avert diseases.
During 1825 he succeeded in carrying stores and reinforcements into Missolonghi, when it was besieged for the second time, though he could not avert its fall.
For a while it seemed that even this would not avert a European war.