Idioms and Expressions with “Moon”

Have you ever been over the moon about some good news? Do you see an old friend only once in a blue moon? In English, the word moon appears in several lovely idioms and expressions, and learning them is a wonderful way to make your English sound more natural, expressive, and memorable. In this lesson, you’ll learn 11 idioms and expressions with “moon” in English, along with clear meanings, natural example sentences, and useful notes about how to use them. Some of these expressions are common in everyday conversation, while others are more colourful, literary, or slightly old-fashioned. All of them can help you expand your vocabulary and understand real English more easily.

These idioms are especially useful for B2 and C1 learners, and they can also help you in Cambridge English exams such as B2 First (FCE) and C1 Advanced (CAE), where idiomatic vocabulary can make your speaking and writing sound more fluent and natural.

Let’s begin.

11 Idioms and Expressions with “Moon” in English

1. Ask for the moon

Meaning: to ask for something that is unrealistic, very difficult, or impossible to get.

• The workers want all their demands to be accepted immediately, which is rather like asking for the moon at the moment.

This expression is often used when someone expects too much.

2. Over the moon

Meaning: extremely happy or delighted.

• When Michael heard that he had won the lottery, he was over the moon.

This is one of the most common and useful idioms with moon in English.

3. Once in a blue moon

Meaning: very rarely; almost never.

• Our son lives abroad now, so we only see him once in a blue moon.

4. Promise someone the moon

Meaning: to promise something wonderful or impossible, especially when you are unlikely to give it.

• He promised her the moon at the start of the relationship, but reality was rather different.

This idiom often has a critical meaning. It suggests empty promises.

5. Reach for the moon / Reach for the stars

Meaning: to be ambitious and try to achieve something great or difficult.

• If you want to succeed, you have to be brave enough to reach for the moon.

Reach for the stars is more common, but reach for the moon is also understood and sounds poetic.

6. Many moons ago

Meaning: a long time ago.

• Many moons ago, mobile phones were enormous and did very little.

This expression sounds a little old-fashioned or storytelling-like, which gives it charm.

7. Moon about / Moon around

Meaning: to move around sadly, dreamily, or without energy, usually because you are unhappy.

• After the break-up, he spent weeks mooning around the house

This is an informal expression and often suggests self-pity or emotional sadness.

8. To the moon and back

Meaning: used to show that you love someone very much.

• She loves her children to the moon and back.

This expression is very affectionate and is often used in families and romantic relationships.

9. The moon on a stick

Meaning: everything you could possibly want; something wonderful or excessive; an unrealistic desire.

• Our manager wants the moon on a stick without increasing the budget.

10. Moon over someone or something

Meaning: to spend time dreaming about someone you love or something you strongly want.

• Sean spent the whole morning mooning over the girl he had met at the party.

This expression often suggests a slightly foolish or overly emotional kind of longing.

11. Moon away

Meaning: to waste time dreaming, brooding, or doing very little.

• He sat by the window mooning away the afternoon instead of revising.

This expression is less common than the others, but it is still understandable and expressive.

Want to Learn More English Idioms?

If you enjoyed expressions such as over the moon, once in a blue moon and promise someone the moon, continue building your idiomatic vocabulary with Say It with Style 2: Advanced English Idioms. Designed for B2–C1 learners, it helps you learn useful idioms naturally through context and practice. For even more idiomatic English, explore the Say It with Style Complete Idioms Collection.

Complete the sentences with the correct idiom from the lesson.

1. We only see our cousins __________ because they live in Australia.
2. When Emma heard she had passed all her exams, she was __________.
3. You can’t just __________ all summer and expect to finish your work on time.
4. He said he would buy her a house, a car, and take her to Paris — he was clearly __________.
5. My father still tells stories about life in the village __________.
6. Stop __________ and come and help me in the kitchen.
7. She loves her little boy __________.
8. The new manager wants __________, but he refuses to hire more staff.
9. After the party, Ben spent days __________ the girl he had met there.
10. Wanting everything to be perfect immediately is a bit like __________.

Answers: 1. once in a blue moon, 2. over the moon, 3. moon away, 4. promising her the moon, 5. many moons ago, 6. mooning about / mooning around, 7. to the moon and back, 8. the moon on a stick, 9. mooning over, 10. asking for the moon

Final Thoughts

Learning idioms and expressions with “moon” in English is a lovely way to make your vocabulary more colourful and expressive. Some of these idioms talk about happiness, some about love, and others about unrealistic hopes or dreamy sadness.

Try to learn them in context, write your own example sentences, and listen out for them in films, books, and conversations. The more often you meet them, the more natural they will become.

And if you only remember two today, make it over the moon and once in a blue moon. Those two are worth their weight in moonlight.