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

Examples

• The match ignites when struck against the box.
• Gasoline ignites easily at high temperatures.
• The spark plug ignites the fuel mixture in the engine.
• Her passionate speech ignites the crowd’s enthusiasm.
• The controversial decision ignites public debate.
• A single comment ignites their long-standing rivalry.