- 1[intransitive] to die
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- 2[intransitive] to be at a low level and fail to improve or increase He said the party had been “flatlining” — failing to increase its level of support — for eight years.
flatline
verbNAmE//ˈflætlaɪn//
(informal)Verb Forms present simple I / you / we / they flatline he / she / it flatlines
past simple flatlined
-ing form flatlining
Check pronunciation: flatline