poetic license

poetic license
license used by a writer or artist to heighten the effect of their work
Hypernyms: ↑license, ↑licence

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poˌetic ˈlicence [poetic licence] (NAmE poˌetic ˈlicense) noun uncountable
the freedom to change facts, the normal rules of language, etc. in a special piece of writing or speech in order to achieve a particular effect

He used a little poetic licence to embroider a good story.

Useful english dictionary. 2012.