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Wiktionary
set on fire

vb. 1 (context transitive English) To cause to begin to burn. 2 (context figuratively transitive English) To arouse passionate feelings in. 3 (en-pastset on fire)

WordNet
set on fire

v. set fire to; cause to start burning; "Lightening set fire to the forest" [syn: set ablaze, set aflame, set afire]