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An extremely impressive event or successful outcome: "September will not be any barnburner [for car sales]" (Lee Iacocca).
Informal. something that is highly exciting, impressive, etc.
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|Noun||1.||barnburner - someone who burns down a barn|
|2.||barnburner - an impressively successful event; "the rock concert was a real barnburner"|
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
success - an event that accomplishes its intended purpose; "let's call heads a success and tails a failure"; "the election was a remarkable success for the Whigs"