Verb tone down has 2 senses
  1. muffle, mute, dull, damp, dampen, tone down - deaden (a sound or noise), especially by wrapping
    --1 is one way to soften
    Sample sentences:
    Somebody ----s something
    Something ----s something
  2. tone down, moderate, tame - make less strong or intense; soften; "Tone down that aggressive letter"; "The author finally tamed some of his potentially offensive statements"
    --2 is one way to change, alter, modify
    Sample sentences:
    Somebody ----s something
    Something ----s something
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