DCHP-2

break up DCHP-1 (pre-1967)

• 1

  of (ice in) rivers and lakes, melt as a result of the spring thaw.

  See also: break v. (def. 1)  break-up (meaning 1a)  

• 2

  of roads, become muddy and often impassable as a result of the spring thaw.