When the missile count got low, the game made a warning sound.

He has been trained to enter a sealed pen if a warning sound starts.

He could not be sure what it was, but the warning sound was coming from that direction, too.

There came no warning sound, but a square of the set stones dipped and was gone, leaving a black hole.

When either of them spots a threat, they give a warning sound to let their partner know that danger is approaching.

Days later, when the warning sound came again, they strapped themselves in.

An hour later the warning sound was more shrill.

The system will also flash a light and make a warning sound.

His soft English trill made the warning sound like a reading of poetry.