upbreak

Upbreak \Up*break"\ ([u^]p*br[=a]k"), v. i.
   To break upwards; to force away or passage to the surface.
   [1913 Webster]
    

Upbreak \Up"break`\ ([u^]p"br[=a]k`), n.
   A breaking upward or bursting forth; an upburst. --Mrs.
   Browning.
   [1913 Webster]