Keening

The keening screech of the brakes startled the pedestrians on the sidewalk.

As the fog rolled in, a keening foghorn warned ships of the treacherous rocks ahead.

The keening of the steam whistle signaled the departure of the train from the platform.

The air raid siren's keening pierced through the city, signaling imminent danger.

As the funeral procession passed by, the sound of keening echoed through the streets.