sub-station

/S AH1 B S T EY0 SH AH0 N/
noun
  1. 1

    A site where electricity supplied by long-distance (high-voltage) transmission lines is transformed and/or regulated for local (low-voltage) distribution.

  2. 2

    A satellite police station serving one neighborhood or part of a larger jurisdiction.

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Source: https://en.wiktionary.org/wiki/sub-station, https://en.wiktionary.org/wiki/substation