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cause to start burning; subject to fire or great heat;
"Great heat can ignite almost any dry matter"
"Light a cigarette"
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start to burn or burst into flames;
"Marsh gases ignited suddenly"
"The oily rags combusted spontaneously"
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arouse or excite feelings and passions;
"The ostentatious way of living of the rich ignites the hatred of the poor"
"The refugees' fate stirred up compassion around the world"
"Wake old feelings of hatred"