lame duck noun 4verb 1forms 4 noun4 •(informal) A person or thing that is helpless, inefficient, or disabled.Reflecting on this in our 800th issue seven years ago, RAIL said the broad government view in 1981 was that BR [British Rail] was a lame duck. — 2024 •An elected official who has lost the recent election or is not eligible for reelection and is marking time until leaving office.Congressman Jones was a lame duck and did not vote on many issues that were important to his constituents. •A server that continues to serve ongoing requests while refusing new ones, allowing for graceful shutdown. •(slang, old-fashioned) A person who cannot fulfill their contracts. verb1 •(informal) To behave in the manner of a lame duck. formslame ducked · lame ducking · lame ducks · lame-ducks