filter down

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filter down ‎(third-person singular simple present filters down, present participle filtering down, simple past and past participle filtered down)

  1. Of a liquid; to move slowly down to lower substrate levels.
  2. (idiomatic)(by extension) Of information, or resources; to move slowly down to lower levels of an organisation, or population.
    They might say that the economy is improving, but it is taking a long time for any money to filter down to the poorer classes.