once in a blue moon 千載難逢地

In English, if things happen extremely rarely, we can say they happen ‘once in a blue moon’.

For examples, you can use this idiom like this:

1. She almost never does her homework. In fact, she does it once in a blue moon.

2. My manager works hard with his laptop all day, so it surprised me that yesterday I saw him playing computer games once in a blue moon.

3. People use e-mails nowadays, so it’s once in a blue moon to receive a hand-written letter.

Do you understand now?

See you next time!

Spiiker mouth