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出典:Wiktionary
Presumably from go over (“to be received”), used as if literally (“to travel above”): a lead balloon would not travel well through the air.
go over like a lead balloon (三人称単数 現在形 goes over like a lead balloon, 現在分詞 going over like a lead balloon, 過去形 went over like a lead balloon, 過去分詞 gone over like a lead balloon)
go over like a lead balloon