run out

There are two main ways to use this phrase, and mixing them up is the most common headache for learners. First, there is the intransitive way: Something runs out. You might say, "The milk ran out yesterday." Here, the milk is the subject doing the "running." It just means it's finished. The second way is transitive with a preposition: Someone runs out of something. You would say, "I ran out of milk." In this version, you are the one who used it all. Grammatically, remember that run out is an irregular phrasal verb. The past tense is ran out, and the past participle is run out. It’s like the regular verb run. If you use it as a noun (a run-out), it usually refers to cricket or a specific technical event, so stick to the verb form for daily life. Don't forget the of when you mention the object! Saying "I ran out milk" sounds like you personally chased the milk out of your house with a broom. While hilarious, it’s not what you mean.

Let’s look at how this sounds in the wild.

Speaker A: "Can you order an Uber? My phone just ran out of juice."

Speaker B: "I would, but I ran out of data this morning scrolling through TikTok!"

See? Both used the phrase naturally. Another scenario: You’re at a job interview on Zoom.

Candidate: "I’m sorry, my laptop is about to run out of power. Let me grab my charger."

Interviewer: "No problem, we’re almost out of time anyway."

In the world of online shopping, you’ll see this everywhere. A website might say, "Hurry! We are running out of stock for these sneakers." It creates that "fear of missing out" (FOMO) that marketers love. Even in music, you might hear a singer complain that their "luck has run out." It’s a versatile little phrase that works for physical objects, time, and abstract concepts like luck or ideas.

Use this phrase whenever you want to sound like a native speaker describing a shortage. It is perfect for everyday household items like groceries, toilet paper, or coffee. It’s also the standard way to talk about technology limits, like battery life, data plans, or storage space on your iCloud. In professional settings, use it for time and budgets. If you’re in a meeting and you only have five minutes left, saying "We are running out of time" is much more natural than saying "The time is finishing." It also works for personal feelings. If your kids are screaming and the dog is barking, you might tell your partner, "My patience is running out!" It signals that a breaking point is near. Basically, if there was a pile of something and now there is no pile, this is your phrase.

Do not use run out if something was stolen or lost. If someone took your phone, you didn't run out of phone. You lost it. Also, don't use it for things that don't have a fixed supply. You don't run out of air while standing in a park, but you might run out of air if you're stuck in a small, sealed box (though I hope that never happens to you). Avoid using it for people leaving a room unless they are literally running. If a guest leaves your party, they didn't "run out." They just left. Finally, don't use it for things that expire. If your milk is old and smells like a gym sock, it has "expired" or "gone off." If you drank it all, it ran out. There is a big difference between a sour latte and no latte at all!

The biggest trap is forgetting the word of.

✗ I ran out money.

✓ I ran out of money.

Another one is using the wrong tense. Since the result (having none left) is usually what matters, we often use the present perfect.

✗ I ran out of milk (This sounds like a story from the past).

✓ I have run out of milk (This explains why I can't give you a glass right now).

Many learners also try to use it with the verb "to be" as if it's an adjective.

✗ The coffee is run out.

✓ The coffee has run out.

It’s a verb, not a state of being! Also, be careful with the word order. You can't put the object in the middle of this phrasal verb.

✗ I ran milk out.

✓ I ran out of milk.

If you say "I ran the milk out," people will think you are participating in a very strange marathon for dairy products.

If you want to spice up your English, you can use finish or use up. Use up is very similar but emphasizes the action of using something. For example, "I used up all the glue." Run out focuses more on the fact that there’s none left. Another common one is be out of. This is a state, not an action. "We are out of bread." It’s the result of running out. If you want to be more formal, especially in business, you might say exhausted. "We have exhausted our resources." It sounds fancy, like you’re wearing a suit while saying it. In slang, you might hear people say they are tapped out. This usually refers to money or energy. "I can't go to the club, I'm tapped out." It’s like a keg of beer that has been tapped until it’s dry.

You will often hear running out used for things that are currently disappearing but aren't gone yet. "Time is running out!" implies there are still a few seconds left. Another variation is run out on someone. Be careful! This means something totally different. If a husband runs out on his wife, he has abandoned her. It’s much more dramatic than just losing your phone battery. There is also the noun runout, which we mentioned is for sports. In some contexts, run out can mean to extend, like a contract. "My lease runs out in December." This means the time period is finishing. It’s a very common way to talk about legal documents or subscriptions like Spotify or Amazon Prime.

Is run out formal? Not really. It’s very neutral. You can use it with your boss ("We ran out of toner for the printer") or your best friend ("I ran out of excuses to skip the gym"). Can I use it for people? Only if you mean they are physically running out of a building. Don't use it to mean someone died or left a relationship unless you use the specific phrase run out on. What’s the difference between run out and empty? Empty is an adjective describing a container. Run out is a verb describing the supply. A bottle is empty because the water ran out. Does it work for ideas? Absolutely! "I’ve run out of ideas for this project" is a very common sentence. It means your brain's supply of creativity is currently at 0%.