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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
running side by side
Grammar usage guide and real-world examplesUSAGE SUMMARY
"running side by side" is correct and usable in written English. You can use it to describe two or more things occurring simultaneously or in close proximity. Example: The two projects are running side by side, each contributing to the overall goal. Alternative expressions include "operating concurrently" and "functioning alongside."
✓ Grammatically correct
News & Media
Science
Encyclopedias
Alternative expressions(20)
operating in parallel
working in tandem
alongside each other
side by side
coexisting
advancing together
functioning simultaneously
in conjunction
moving in parallel
headed in the same direction
moving in unison
following a similar trajectory
acting in concert
in perfect synchrony
move in unison
following the same beat
keeping pace
traveling in the same direction
proceeding in parallel
happening concurrently
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
32 human-written examples
The event featured four drivers running side by side, instead of the typical two-lane format.
News & Media
Maybe it's because you're running side by side and not looking at each other.
News & Media
They seemed to be running side by side on a familiar treadmill.
News & Media
"We'll have those choices up and running, side by side, by September," Mr. Nevels said.
News & Media
"They were just running, side by side, not talking," she said.
News & Media
A section of gangline for each dog or pair of dogs running side by side is about 8 feet (2.5 metres) long.
Encyclopedias
Human-verified similar examples from authoritative sources
Similar Expressions
28 human-written examples
When he saw Patrick racing toward the back of the pack, wasting time running side-by-side with another trailer, he got on the radio and explained that neither car would benefit by that tactic.
News & Media
A slight delay within the McLaren pit saw both Kubica and Raikkonen get out ahead of Hamilton, the BMW and the Ferrari running side-by-side towards the end of the pit lane – just as the red light came on to prevent cars leaving as other cars passed the pit exit.
News & Media
All data were generated using a custom two-dimensional model that describes convection and diffusion in a system of two fluids running side-by-side in a duct.
Aldoss and Obeidat[4] used the discrete vortex method to analyze the performance of two Savonius rotors running side-by-side at different separations.
Rather, Ubuntu for Android it the full Ubuntu desktop running side-by-side with Android on a shared kernel that provides context appropriate access to all your content.
News & Media
Expert writing Tips
Best practice
Use "running side by side" to describe physical alignment and parallel movement, like runners in a race or roads next to each other.
Common error
Avoid using "running side by side" to describe static arrangements or items that are simply located next to each other without any implied movement or parallel action. Use "next to each other" or "beside each other" instead.
Source & Trust
85%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "running side by side" functions as a gerund phrase, often acting as an adverbial modifier describing how something is done, or as part of a verb phrase, indicating concurrent action. As Ludwig shows, it's frequently used to describe simultaneous processes or physical movement.
Frequent in
News & Media
50%
Science
30%
Wiki
10%
Less common in
Encyclopedias
5%
Formal & Business
3%
Reference
2%
Ludwig's WRAP-UP
In summary, the phrase "running side by side" is a common and correct gerund phrase that effectively conveys simultaneous progress, cooperation, or close physical alignment. As indicated by Ludwig, it finds frequent use in News & Media and Science, with a neutral register suitable for various contexts. While alternatives like "operating in parallel" and "working in tandem" exist, "running side by side" provides a more accessible and dynamic expression. The key is to reserve its use for situations where simultaneous activity or movement is genuinely implied, avoiding its application to static arrangements.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
side by side
Similar but more general, lacking the active "running" connotation.
alongside each other
Emphasizes the physical proximity or alignment of two or more entities.
operating in parallel
Emphasizes the simultaneous execution of processes or activities.
working in tandem
Highlights the coordinated effort of two or more entities.
coexisting
Focuses on the simultaneous existence of different entities or phenomena.
marching abreast
Implies a synchronized progression, often in a figurative sense.
advancing together
Suggests a shared goal and coordinated movement forward.
existing concurrently
Highlights the simultaneous existence of two or more things.
functioning simultaneously
Focuses on the parallel operation of systems or processes.
in conjunction
Indicates a combined or cooperative action.
FAQs
How can I use "running side by side" in a sentence?
You can use "running side by side" to describe activities happening in parallel, like "The two companies are "operating in parallel"". Or, to describe physical alignment and movement, such as "The runners were "running alongside each other"".
What does "running side by side" mean?
"Running side by side" generally means two or more entities are progressing or operating simultaneously and in close proximity. It can refer to physical movement or abstract processes occurring "existing concurrently".
Are there other ways to say "running side by side"?
Yes, depending on the context, you could use phrases like "working in tandem", ""operating in parallel"", or ""existing concurrently"".
Is "side by side" the same as "running side by side"?
While similar, "side by side" implies proximity without necessarily indicating movement or active progress. "Running side by side" suggests simultaneous movement or operation. For example, roads can be "alongside each other", but runners are "marching abreast".
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
85%
Authority and reliability
4.6/5
Expert rating
Real-world application tested