ice jam

noun
1.
an obstruction of broken river ice in a narrow part of a channel.
2.
a mass of lake or sea ice broken and piled up against the shore by wind pressure.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Other types of flash floods can occur from dam or levee failures, or a sudden
  release of water held by an ice jam.
As the day waned, a backflow of ice and water caused by the ice jam downstream
  began moving.
The sudden break-up of an ice jam or the failure of a dam may also result in
  flash flooding.
Comprehensive records of ice jam damage were not found.
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