rumbling - definition and synonyms

noun [countable] 

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/ˈrʌmblɪŋ/
singularrumbling
pluralrumblings
  1. 1
    [usually plural] talk or signs of people being unhappy with a situation

    There are rumblings in the banking sector that the system isn’t working.

  2. 2
    [usually singular]

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    a continuous deep sound
    rumbling of:

    The rumbling of heavy artillery could be heard in the distance.