Complete Works of Virginia Woolf:
The sense of untapped resources, things to say as yet unsaid, made the hour significant, so that in future years the entire journey perhaps would be represented by this one scene, with the sound of sirens hooting in the river the night before, somehow mixing in.
available but not yet used;
1. if a car horn hoots or you hoot or hoot the horn, the horn makes a loud noise;
2. to make a loud noise