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Similar term(s): breakup, ice break-up.
Definition:
The breaking, melting, and loosening of ice in the spring.
Source & ©: Merriam-Webster
Online Dictionary 
More:
Global warming is already causing an earlier break-up of ice on rivers and lakes.
Source & ©: GreenFacts Digest on Arctic Climate Change,
based on ACIA
To read about this term in context: GreenFacts Digest on Arctic Climate Change:
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