break (with) precedent

:  to separate into parts with suddenness or violence

:  fracture

: to fracture a bone of (a bodily part)

:  an act or action of breaking

:  the opening shot in a game of pool or billiards

:  a gap or opening caused or appearing as if caused by damage :  a condition produced by or as if by breaking :  gap

:  prior in time, order, arrangement, or significance

:  an earlier occurrence of something similar

:  something done or said that may serve as an example or rule to authorize or justify a subsequent act of the same or an analogous kind

:  the convention established by such a precedent or by long practice