What term refers to a speaker's use of persuasive language to persuade an audience?

Which pair of uses of figurative language from "the caged bird" support the extended metaphor of freedom versus oppression? back of the wind; floats downstream his wings are clipped; his feet are tied the caged bird sings; the free bird thinks dawn bright lawn; grave of dreams

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Which link would readers of this dictionary entry click if they wanted more information about the historical origins of the word language