The spark will touch off the fireworks
His comment was enough to touch off a heated argument
The new policy could touch off widespread protests
A small incident can sometimes touch off a major crisis
The news of the scandal touched off a wave of public anger
Investigators are trying to determine what exactly touched off the explosion
Her passionate speech was intended to touch off a movement for change
The unexpected question touched off a moment of awkward silence
Don't say anything that might touch off his temper
The cold weather has touched off a surge in respiratory illnesses
Did you hear that small spark touch off the fireworks display?
Yes, it was quite surprising and spectacular indeed.
I agree, it was a perfect start to the evening.
The rumor seemed to touch off a wave of panic
The rumor caused a wave of panic
Panic spread quickly because of the rumor