tone down

/T OW1 N D AW1 N/
verb
  1. 1

    To relax; to make quieter or less obtrusive; to make milder.

    โ€œAsk them to tone down that orange and pink color scheme a bit.โ€

  2. 2

    To moderate or relax; to diminish or weaken the striking characteristics of; to soften.

  3. 3

    To make a television program, piece of writing, etc. less offensive and so more suitable for a family audience.

Source: https://en.wiktionary.org/wiki/tone%20down