Voici une expression idiomatique associée à la lune :

Today’s idiom is really easy to understand !

To be over the moon

When you are over the moon, you are extremely happy about something!

You feel as if you could jump… over the moon with joy!

 

Examples:

Sam told her: “Close your eyes and give me your hand please, I have a surprise for you!” She felt something in her hand. When she opened her eyes, she was holding a red rose. On the rose, there was an engagement ring. He said: “Darling, will you marry me?” Heather was so happy, she was over the moon!

Lucy was over the moon with her new car.