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
during their expansion
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "during their expansion" is correct and usable in written English.
It can be used to refer to a specific time period when an entity, such as a company or organization, is growing or increasing in size or scope. Example: "The company faced several challenges during their expansion into international markets."
✓ Grammatically correct
Science
News & Media
Alternative expressions(1)
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
17 human-written examples
Modern humans likely exchanged genes with Neanderthals prior to or early during their expansion out of Africa.
OEC reveal a highly differentiated endothelial phenotype as well as a high phenotypic stability during their expansion.
Science
This is due to the loss of the homing signal on the surface of the MSCs during their expansion in culture.
Science
This analysis of the recent literature once again shows the intrinsic relationship between critical quality attributes (CQA) of hMSC expanded for cell therapy and critical process parameters (CQP) used during their expansion.
Science
While low temperature stress remains as the pivotal limitation in rice production in temperate regions (Andaya and Tai 2006), the acclimation to long day conditions of northern rice cultivars represents one of the main constrains during their expansion, and the most evident difference with the cultivars that remained in tropical latitudes (Izawa, 2007).
Science
I highlight the observation that H4R3me2s is highly prevalent in the proliferating NSCs during their expansion phase and prior to the onset of differentiation and is thus likely to be associated with the "stem-like" cellular state of the NSCs.
Science
Human-verified similar examples from authoritative sources
Similar Expressions
43 human-written examples
Given the ancestral homelands of these later tribes in the West, it is likely that they would have brought NRY lineages with them to Central Asia during their expansions into the region.
Science
Serving on the Advisory Board of the Peggy Guggenheim Collection in Venice, Italy, she was active during their European expansion and beyond, and was an active member of many other institutions, including The Metropolitan Museum, Museum of Modern Art, The Frick Collection and Whitney Museum of American Art.
News & Media
The Colorado Rockies, once baseball's attendance kings during their 1990s expansion years, are off by over 1,000 fans per game despite roaring into the playoff picture after a rough start.
News & Media
Collectively, these results indicate that activated OVA specific CD8+ T cells have an apoptotic-like phenotype during their early expansion phase, while the cell number continues to increase.
Science
Whether these host cellular processes are not targeted by merozoite gene products during their asexual expansion in cat enterocytes, or if as yet unannotated merozoite-specific paralogs exist to perform this function, remain to be established.
Science
Expert writing Tips
Best practice
When using "during their expansion", ensure the context clearly defines who "their" refers to, avoiding ambiguity.
Common error
Avoid using "during their expansion" when referring to a static state or a period of decline. This phrase implies active growth.
Source & Trust
81%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "during their expansion" functions as a prepositional phrase modifying a verb or noun, indicating the temporal context of an action or state. As Ludwig AI explains, it is usable in written English, specifying a timeframe where growth or enlargement is occurring. Examples from Ludwig showcase the phrase in diverse contexts.
Frequent in
Science
85%
News & Media
10%
Formal & Business
3%
Less common in
Wiki
2%
Reference
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, the phrase "during their expansion" is a prepositional phrase that provides temporal context, specifying when an event occurs in relation to the growth or development of something. Ludwig AI confirms its correct usage in written English. It is commonly found in scientific and news contexts, indicating a formal to neutral register. When using this phrase, ensure clarity regarding who "their" refers to and that the subject is indeed actively growing. Alternatives include phrases such as "throughout their growth phase" or "as they expanded". Common errors involve using the phrase in static or declining contexts. This phrase helps writers provide precise temporal framing in their communication.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
throughout their growth phase
Replaces "expansion" with "growth phase", emphasizing the process of growing.
while they were expanding
Uses a continuous tense to highlight the ongoing nature of the expansion.
as they expanded
A more concise way of saying "during their expansion", focusing on the act of expanding.
in the course of their growth
Similar to "during their expansion" but uses "growth" instead of "expansion".
at the time of their expansion
Focuses on a specific point in time within the expansion period.
during the period of their growth
Emphasizes the timeframe within which the growth occurred.
while in a growth spurt
Emphasizes a quick expansion.
in their expanding years
Highlights the years during which the expansion took place.
concurrent with their enlargement
A more formal way of saying "during their expansion", using "enlargement" as a synonym.
in the midst of their development
Similar to "during their expansion" but uses "development" to emphasize growth and advancement.
FAQs
How can I rephrase "during their expansion" for variety?
Consider using alternatives like "throughout their growth phase", "while they were expanding", or "as they expanded" to add variety to your writing.
Is it always appropriate to use "during their expansion"?
No, ensure the subject is actively growing or increasing in scope. For periods of stability or decline, other phrases are more suitable.
What is the difference between "during their expansion" and "after their expansion"?
"During their expansion" refers to the period when growth is ongoing, while "after their expansion" refers to the period following the completion of growth. One is a process, the other is a result.
Can I use "in their expansion" instead of "during their expansion"?
While not grammatically incorrect, "in their expansion" is less common and may sound awkward. "During their expansion" is generally the preferred choice.
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
81%
Authority and reliability
4.1/5
Expert rating
Real-world application tested