intransitive verb Date: 1980 1. to register on an electronic monitor as having no brain waves or heartbeat, die , 2. to be in a state of no progress or advancement, to come to an end, ~r noun
FLATLINE
Meaning of FLATLINE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012