Definition of poetic licence in English English dictionary
Any departure from convention or from factual accuracy taken by a writer to achieve a desired effect
If someone such as a writer or film director uses poetic licence, they break the usual rules of language or style, or they change the facts, in order to create a particular effect. All that stuff about catching giant fish was just a bit of poetic licence. poetic license the freedom that poets and other artists have to change facts, ignore grammar rules etc, because what they are making is poetry or art