on cloud nine

You usually use it with the verb to be. You can say 'I am on cloud nine' or 'She has been on cloud nine all week.' It works perfectly when you want to emphasize that someone’s mood is exceptionally bright. It is like adding a turbo-boost to the word 'happy.'

Use it for the big milestones in life. Think about weddings, job promotions, or passing a difficult exam. It is great for texting a friend after a great night out. You can also use it in a professional setting if the news is truly celebratory. Just imagine you are sharing a 'high-five' with your words.

Avoid using this for small, everyday pleasures. If you just had a decent sandwich, you aren't on cloud nine. That would sound a bit dramatic! Also, do not use it in sad or serious situations. If a friend is going through a breakup, telling them you are on cloud nine about your new shoes might make you look a bit insensitive.

People have argued about where this comes from for years. Some say it refers to old weather classifications where 'Cloud 9' was the highest, fluffiest cumulus cloud. Others think it relates to stages of enlightenment. Regardless of the history, English speakers today just associate it with pure, unadulterated bliss. It became very popular in the mid-20th century and has stayed a favorite ever since.

You might occasionally hear people say they are over the moon or walking on air. These mean almost the same thing. However, on cloud nine feels a bit more modern and energetic. Just remember: there is no 'Cloud 8' or 'Cloud 10' in this idiom. Stick to nine, or people will think you are lost in the sky!