Meaning of “flatline” in the English Dictionary

"flatline" in British English

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flatlineverb [ I ]

uk /ˈflæt.laɪn/ us /ˈflæt.laɪn/ informal

(Definition of “flatline” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"flatline" in Business English

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flatlineverb [ I ]

uk /ˈflætlaɪn/ us

to remain at the same, usually low, level:

For the past two years, both the job market and house prices have flatlined in the area.
The party has spent the last three months flatlining with a 34% popularity rating in the monthly polls.
flatlining
noun [ U ]

The effects of the music industry's flatlining have been felt by retailers.

(Definition of “flatline” from the Cambridge Business English Dictionary © Cambridge University Press)