Question

We eat at a restaurant only once in a blue moon.

What does “once in a blue moon” mean?

Options

• (A) Every night
• (B) On special holidays only
• (C) In the evening
• (D) Very rarely

Answer

(D) Very rarely

Solution

1. A blue moon is a rare event, and the idiom takes its meaning from that.
2. In the sentence, the speaker eats at a restaurant only occasionally.
3. So the idiom means very rarely, which is option D.