False. IT is the repetition of the first syllable. I wish rappers would utilize this device more, becuase when they do it sounds awesome! :-)
I think it is an idiom but I might be wrong
Some examples of similes from 'Letters from Birmingham Jail':
<span>"Like a boil that can never be cured so long as it is covered up but must be opened with all its ugliness to the natural medicines of air and light, injustice must be exposed...."
</span>
<span>"Asia and Africa are moving with jetlike speed..."
</span>
