Hyperbole, it should not be taken literally.
I'm not exactly sure what you mean but "yield" might be a possible answer if i am assuming correctly.
The main argument in this piece is that Black English is termed as its' own distinct language, white English or dissimilar to American. Black English is not simply a dialect of English but its' own language.
Language is a way of expressing yourself, as well as in Black English does exactly the same way, by expressing the kind of lives that black people had lived. The overcoming of slavery is being represented by the development of their languages and submission to the American people during that period of time.
Since their development under more extreme circumstances and different, it has enriched the culture of African American which made them recognize Black English as their language.
its is a metaphor
because it is more active
