Bless is a verb that primarily means to confer or invoke divine favor upon someone or something.
Common usages include:
1. "God bless you" - a common expression after someone sneezes
2. "Bless this food" - a prayer before meals
3. "Bless your heart" - an expression of sympathy (sometimes sarcastic in Southern U.S.)
4. "Blessed" - the past tense and past participle form
5. "Blessing" - the noun form meaning a beneficial thing