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flatline

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verb [intransitive] informal flatline pronunciation in British English /ˈflætˌlaɪn/ 
Word Forms
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present tense
I/you/we/theyflatline
he/she/itflatlines
present participleflatlining
past tenseflatlined
past participleflatlined
  1. 2
    mainly journalism to fall to a very low level

    After a period of rapid growth, demand for mobile phones has almost flatlined.

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