poetic license
US /ˌpoʊ.ɪt.ɪk ˈlaɪ.səns/
UK /ˌpoʊ.ɪt.ɪk ˈlaɪ.səns/
1.
the freedom to depart from the facts of a matter or from the conventional rules of language when telling a story or for artistic effect
:
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The director took some poetic license with the historical events to make the film more dramatic.
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While the poem is based on real events, the author used poetic license to enhance the emotional impact.