To run out of something means there is none of it left or available, even though nothing involved has actually run anywhere.
What Does Run Out Mean?
Picture it literally: milk, sprinting out of the fridge and down the street. That's not what happened. The milk sat in the fridge the entire time, perfectly still, slowly becoming less and less of itself until there was none left.
We've run out of milk again. Can you grab some on the way home?
Run out of just means: the supply is finished.
Natural Examples
We ran out of milk, so breakfast was just toast.
They ran out of time before finishing the test.
I've completely run out of patience with this printer.
The car ran out of fuel halfway up the hill.
Can You Separate It?
No. Run out of is inseparable: the three words stay together, and whatever is finished always comes right after "of."
✅ We ran out of milk.
✅ We ran out of it.
❌ ~~We ran milk out of.~~
How to Use It
- Everyday objects: We ran out of coffee this morning.
- Money: He ran out of money before the trip even ended.
- Time: They ran out of time during the exam.
- Feelings and abstract things: I've run out of patience / She ran out of ideas halfway through the project.
You Run Out Of It. It Just Runs Out.
Here's the OddLingo-sized grammar point: there are two ways to talk about the same empty fridge.
You run out of something:
"We ran out of milk."
The supply itself can just run out, with no "of" and no person needed:
"The milk ran out."
Same empty fridge. Different grammar.
One More Job
Documents and agreements can also "run out," meaning their period of validity ends:
"My passport runs out next month."
Apparently supplies aren't the only things that can run out.
Common Mistakes
Don't drop "of."
❌ We ran out milk.
✅ We ran out of milk.
Don't split it with the object.
❌ We ran milk out of.
✅ We ran out of milk.
In a Conversation
Tom: Why does the printer always jam right before a deadline?
Mia: Honestly, I think it's run out of patience with us.
Tom: That makes two of us. I ran out of mine an hour ago.
Easy Way to Remember It
Picture a tank slowly draining, not a person running anywhere. Run out of is about a supply emptying out, drop by drop, until the tank reads zero.
Similar Expressions
- run out of steam: to lose energy or motivation partway through something. The team ran out of steam in the final minutes.
- use up something: a plainer way to describe finishing a supply completely. We used up all the paper.