flatline - definition and synonyms

verb [intransitive] informal 

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/ˈflætˌlaɪn/
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.