Definition of Breakin -
The Gospel of Hip Hop, 2nd Overstanding,The Refinitions (I-V pg113 - 114)
On the east coast these dance forms would be called
Breakin or b-boying. On the west coast these freestyle dance forms would be called Boogying (Boogie-ing), Popping and Locking. However, both coasts were united by their love for the breaks in certain recordings.
The Gospel of Hip Hop, 9th Overstanding, The Freestyles,  v5 pg 385
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