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New American Oxford Dictionary

flatline

flat line |ˈflatˌlīn ˈflætlaɪn | verb [ no obj. ] informal 1 (of a person ) die. (of a project or undertaking ) fail: the film has flatlined. 2 fail to increase; remain static: their share of the vote has flatlined at about 3 \%. DERIVATIVES flat lin er noun ORIGIN 1980s: from flat 1 + line 1 (with reference to the continuous straight line displayed on a heart monitor, indicating death ).

 

Oxford Dictionary

flatline

flat |line |ˈflatlʌɪn | verb [ no obj. ] 1 informal (of a person ) die. (of a project or undertaking ) fail: her career has flatlined about three times already. 2 fail to increase; remain static: their share of the vote has flatlined at about 3 \%. DERIVATIVES flatliner noun ORIGIN 1980s: from flat 1 + line 1 (with reference to the continuous straight line displayed on a heart monitor, indicating death ).

 

Sanseido Wisdom Dictionary

flatline

fl t l ne 動詞 自動詞 死ぬ 〘心電図が直線になることから 〙; be flatlining 〗(統計などで )低迷している .