Synonyms for Say thank you:

• v.

  •thank (verb)
  • bow down,
  • be indebted,
  • praise,
  • be grateful,
  • acknowledge,
  • be obligated,
  • bless,
  • smile on,
  • show courtesy,
  • kiss,
  • be obliged.

• Other synonyms:

  •thank
  • bowed down,
  • showing appreciation,
  • giving thanks,
  • bowing down.
  •Other relevant words:
  • give thanks,
  • show gratitude,
  • thanks,
  • show appreciation.