set off

verb

1. put in motion or move to act"trigger a reaction"
2. depart for someplace"The family took off for Florida"
3. direct attention to, as if by means of contrast"This dress accentuates your nice figure!"
4. cause to burst with a violent release of energy"We exploded the nuclear bomb"
5. make up for"His skills offset his opponent's superior strength"
6. set in motion or cause to begin"The guide set the tour off to a good start"
7. provoke or stir up"incite a riot"