1. To sink or fall to the bottom; to settle, as lees.
  2. To tend downward; to become lower; to descend; to sink.
  3. To fall into a state of quiet; to cease to rage; to be calmed; to settle down; to become tranquil; to abate.
    The sea subsides.
    The tumults of war will subside.
    The fever has subsided.

The above text is a snippet from Wiktionary: subside
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