That modest action seems to have set off a wave of volunteer service activity.

It was never my intention to set off a wave of controversy.

This set off a second wave of laughter, louder and more intense than the first.

The killing set off a wave of ethnic violence in which at least 150,000 people on both sides were killed.

Instead, his punch set off a new wave of turmoil.

That set off a fresh wave of contention in the group.

That attack set off a new wave of violence.

It set off an intense wave of dizziness in him.

This set off a second wave of laughter, louder and.

The treatment is expected to set off a wave of similar experiments.