(God) bless you
1. An phrase wishing good health to someone who has just sneezed. God bless you! Do you need a tissue? Bless you! That was a big sneeze!
2. A phrase wishing God's blessings upon someone. We will never forget your help. God bless you.
3. An expression of one's appreciation for another person. In this usage, "God" is not usually used. A: "Here, I got coffee for you too." B: "Oh, bless you! I'm so tired today."