smile (up)on so or sth meaning

[American slang]
to bestow approval on someone or something. (Upon is formal and less commonly used than on.)
  Fate has smiled upon me at last!
  I wish good luck would smile on me.

• smile on so or sth:    [American slang]to ...
• smile at so:    [American slang]to ...
• put a smile on so's face:    [American slang]Fi ...