Brast

from The Collaborative International Dictionary of English v.0.48

Breste \Bres"te\, v. t. & i. [imp. {Brast}; p. p. {Brusten},
   {Borsten}, {Bursten}.]
   To burst. [Obs.] --Chaucer.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Brast \Brast\, v. t. & i. [See {Burst}.]
   To burst. [Obs.]
   [1913 Webster]

         And both his y["e]n braste out of his face. --Chaucer.
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         Dreadfull furies which their chains have brast.
                                                  --Spenser.
   [1913 Webster]