Meanings of long quavering in English

Suddenly he uttered a long quavering cry which was taken up by those who followed him.

A howl that drowned the shouts of the officers, a long quavering yell, burst from the ambuscade.

A tall thin man of about sixty rose in his place, and pointed a long quavering finger at the speaker.

He was received with a long quavering cry of welcome by the women, and by a deeper hum of applause by the men.

The long quavering cry, the Indian yell rose and died again and in the black forest, still for aught else, it was weird and unearthly.

Klartch, to Cat's surprise, turned away from the food and went shambling and stumbling across the road, making squeaks and hoots and long quavering whistles.