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lame-duck session

[leym-duhk]
noun
  1. (formerly) the December to March session of those members of the U.S. Congress who were defeated for reelection the previous November.
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Origin of lame-duck session

An Americanism dating back to 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018