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- [intransitive]
to be at a low level and fail to improve or increase 处于低潮；没有起色 He said the party had been ‘flatlining’—failing to increase its level of support—for eight years. 他说，八年来，该党一直在“扁平化”，未能增加其支持水平。
- [intransitive]
to die; to become clinically dead even if you later recover 死；断气 I flatlined twice and was on life support for several days. 我吃了两次饭后一直靠生命维持几天。
Word Origin1980s: from flat ‘level’ + line (with reference to the continuous straight line displayed on a heart monitor, indicating death).