Bottleneck works as both a noun and a verb — which is exactly the kind of detail that trips learners up, because the two forms don't sound equally natural in every sentence.
Both are correct: "a/the bottleneck" as a noun, "[step] is bottlenecking [outcome]" as an active verb, or "[process] is bottlenecked by [constraint]" as a passive verb.
Three forms, three patterns
"Noun: 'Legal review is the bottleneck.'"
This is the default. When in doubt, reach for the noun with an article — "a bottleneck" or "the bottleneck."
"Active verb: 'The single-reviewer step is bottlenecking every pull request.'"
Here the bottleneck itself becomes the subject doing the capping — useful when you want to describe the effect a step is having, in motion, rather than just naming it.
"Passive verb: 'Onboarding is bottlenecked by a shortage of trained specialists.'"
This flips the emphasis onto what's being capped, with the cause attached at the end. Useful when the process being slowed is the more important part of the sentence.
The verb forms are real but less frequent than the noun, so the noun is usually the more natural default — reach for a verb form when it genuinely fits better, not as a rule to force into every sentence.
Common mistakes
Mistake: "the process is bottleneck," treating it as an adjective.
Want to learn "Bottleneck" in depth?
Lyra Practice teaches advanced non-native professionals the nuance of high-value expressions like this one, then has you practice using them in realistic work scenarios.
Start learning for free →It isn't one. There's no adjective form. Use the noun with an article, or one of the two verb forms above — never bottleneck bare, doing an adjective's job.
What verbs go with "bottleneck"?
Once you're using the noun, the verbs around it matter too. Different verbs signal different stages of dealing with the constraint: diagnosis, cause, emergence, or mitigation.
Use identify, find, or diagnose to spot one:
"'We identified the bottleneck in Tuesday's review.'"
Use become, create, or introduce to describe how one appears:
"'The new approval step is creating a bottleneck we didn't have before.'"
Use remove, eliminate, ease, resolve, or address to describe fixing it:
"'We're working to remove the bottleneck by adding a second reviewer.'"
Mistake: "make a bottleneck" or "do a bottleneck." Neither is natural. Reach for identify, create, or remove depending on what's actually happening — diagnosis, cause, or fix.
Choosing the right verb tells stakeholders exactly what's happening and what move comes next, which is worth more than it sounds like for a single word choice.
Practice scenarios
Practice all forms of bottleneck in situations like:
- naming a bottleneck with the noun form in a status update
- describing a step actively capping an outcome with the verb form
- choosing between identify, create, and remove depending on the stage you're describing
Useful practice phrases:
- "[Step] is the bottleneck."
- "[Step] is bottlenecking [outcome]."
- "[Process] is bottlenecked by [constraint]."
- "We identified/are removing the bottleneck by [action]."