undercurrent - definition and synonyms

noun [countable] 

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/ˈʌndə(r)ˌkʌrənt/
singularundercurrent
pluralundercurrents
  1. 1
    a current that moves below the surface or below another current in the sea or a river
  2. 2
    a feeling that exists and affects how people behave, but is not obvious or stated directly
    undercurrent of:

    An undercurrent of tension pervaded the proceedings.