1. to set fire to something or catch fire
2. to cause strong feelings or reactions to begin suddenly

Examples

• The match ignited the dry leaves instantly.
• Lightning can ignite forest fires during dry seasons.
• The gasoline fumes ignited when they reached the pilot light.
• His speech ignited passion among the protesters.
• The scandal ignited a fierce debate in Congress.
• Her performance ignited the crowd’s enthusiasm.
• The controversy ignited tensions between the two groups.