verb (v)

• wear off or die down(verb.change)

  Example:
  The pain subsided.
  

  Synonym:
  lessen
  

  source: wordnet30
• sink to a lower level or form a depression(verb.motion)

  Example:
  The valleys subside.
  

  source: wordnet30
• sink down or precipitate(verb.motion)

  Example:
  The mud subsides when the waters become calm.
  

  Synonym:
  settle
  

  source: wordnet30
• descend into or as if into some soft substance or place(verb.motion)

  Example:
  She subsided into the chair.
  

  Synonym:
  sink
  

  source: wordnet30
• To sink or fall to the bottom; to settle, as lees.(verb)

  source: webster1913