Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
filling up
Grammar usage guide and real-world examplesUSAGE SUMMARY
"filling up" is correct and usable in written English.
It is used to describe when something (usually a container) becomes filled with a substance. Example: The water bottle was quickly filling up with soda.
✓ Grammatically correct
News & Media
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
58 human-written examples
It is filling up.
News & Media
The restaurant was filling up.
News & Media
Even campsites were filling up.
News & Media
Our EOC is filling up.
News & Media
The ballroom was filling up.
News & Media
They're filling up.
News & Media
Hotels are filling up.
News & Media
But buses going east were filling up.
News & Media
The car park was filling up.
News & Media
Meanwhile, storage tanks were filling up rapidly.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
By nightfall in Cairo, Tahrir Square was filling up.
News & Media
Expert writing Tips
Best practice
When referring to emotional fulfillment, consider more nuanced alternatives like "finding satisfaction" or "gaining contentment" instead of "filling up" with emotions.
Common error
Avoid using "filling up" to describe abstract concepts that don't involve physical space or containers. For example, instead of saying "filling up with knowledge", consider "gaining knowledge" or "acquiring expertise".
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The primary grammatical function of "filling up" is that of a phrasal verb. It describes an action where something is becoming full or occupied. As Ludwig highlights, it’s widely used to describe the process of something becoming full, such as a container or space.
Frequent in
News & Media
67%
Science
17%
Wiki
6%
Less common in
Formal & Business
3%
Reference
0%
Academia
0%
Ludwig's WRAP-UP
In summary, "filling up" functions as a phrasal verb used to describe the process of something becoming full or occupied. As Ludwig AI confirms, the phrase is grammatically correct and widely used, primarily in neutral contexts like news and media. While versatile, it's important to consider the specific nuance you want to convey; alternatives like "becoming full" or "reaching capacity" may be more appropriate in certain scenarios. Additionally, using "filling up" in abstract contexts may sound unnatural, so opting for more direct language such as "gaining knowledge" can improve clarity.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
becoming full
Focuses on the state of transitioning to fullness rather than the action.
becoming occupied
Highlights the sense of space being taken up, applicable to rooms or schedules.
getting crowded
Specifically relates to an increase in the number of people or things in a space.
reaching capacity
Implies a limit is being approached or has been reached.
loading up
Suggests an action of adding items to a container or space.
stocking up
Emphasizes accumulating a supply of something.
replenishing
Conveys the idea of restoring something to a full state.
swelling
Suggests an increase in volume or size.
accumulating
Focuses on the gradual collection of something.
topping off
Implies adding to something already partially full.
FAQs
How can I use "filling up" in a sentence?
You can use "filling up" to describe something becoming full. For example, "The gas tank is "filling up"" or "The stadium was "filling up" quickly before the concert."
What are some alternatives to "filling up"?
Depending on the context, you can use alternatives like "becoming full", "becoming occupied", or "reaching capacity".
Is it correct to say "filling up with emotions"?
While grammatically correct, "filling up with emotions" might sound awkward. Consider using more nuanced phrases like "overwhelmed by emotions" or "experiencing strong emotions" for better clarity.
What's the difference between "filling up" and "loading up"?
"Filling up" generally implies a space or container becoming full, while "loading up" suggests the action of adding items to a container or space, often with the intention of carrying or transporting them.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
87%
Authority and reliability
4.5/5
Expert rating
Real-world application tested