It is the reflex blinking that occurs in response to the rapid approach of an object.

The rapid approach of autumn's early darkness often surprised her.

Suddenly the herds became aware of their rapid approach, and they burst into full flight.

She needed to find a course down to the structure, one that would allow her a rapid approach.

The problem was made more acute by the rapid approach of the rebels to the airport.

News came of Tiberius's rapid approach at the head of his new army.

With the rapid approach of evening, there should be candles lit.

On the security side, a rapid approach is essential.

I would like to add a third, to wit, the rapid and direct approach of a known killer.

In his absorption he did not observe the rapid approach of a boy some- what younger than himself, mounted on a bicycle.