Sally: How are you, Betty?
Betty: Oh, I’m on top of the world. I just got a great new job, my son got engaged, and my daughter won an award.

Feeling “on top of the world” means being very, very happy. In idioms, “high” usually means “good”, so being above the rest of the world is the absolute best place to be.


「世界の上にいる on top of the world」は、とてもとても嬉しい気持ちです。通常イディオムでは、「高い high」は良いことですので、世界のどこよりも上ってことは最高の場所ですね。