What does regression mean in software engineering?

A regression is a bug or broken feature that appears after a code change. It means something that was working correctly stopped working because of recent modifications. For example, if you update the login system and suddenly users cannot reset their passwords, that is a regression.

How do you use regression in a sentence at work?

You might say: We found a regression in the dashboard, or We should regression-test before releasing, or This change introduced a critical regression. You can use it as a noun (the regression) or in compound terms (regression test, regression bug).

Is regression formal or informal?

Regression is neutral and professional. It is used regularly in both formal meetings and casual team conversations. It is the standard technical term in the industry, so using it makes you sound knowledgeable.

Can regression be used as a verb?

Not directly. You do not regression something. Instead, you use phrases like regression-test, introduce a regression, or catch a regression. The verb forms are separate: test, break, or fail.

What is the difference between a regression and a regular bug?

A regression is specifically a bug caused by recent code changes. A regular bug could have existed in the code from the start. Regressions are particularly frustrating because they break things that used to work.

Regression meaning in tech — Speak Tech English

Commonness	4/5
Versatility	4/5
Formality	CasualFormalNeutral
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓We introduced a regression in the login flow

✓This is a regression from the last release

✓We need to run regression testing before deployment

Real examples

in a standup

"I found a regression—the user profile page is now throwing a 500 error after yesterday's changes."

in a code review

"Have you tested this thoroughly? I am worried it might introduce a regression in the checkout process."

in a team meeting

"We should add regression tests to our CI pipeline to catch these issues automatically."

Don't say this

Handle with care. Do not confuse with statistical regression (data analysis). In software, regression always means a bug that appeared after a code change.

✕We need to regression the code.

✓We need to regression-test the code, or: We need to check for regressions.— Regression is a noun describing the problem, not a verb. You cannot regression something; you test for regressions or fix a regression.

✕The regression happened because of a statistical error.

✓The regression happened because our code change broke the API.— In tech context, regression means a bug from code changes, not a statistical calculation issue.

✕We will regression this issue.

✓We will investigate this regression, or: We will regression-test this module.— Regression should be used as a noun or in compound nouns like regression test, not as a verb in this context.

Other forms

noun

regression

"We discovered a critical regression in the payment module."

adjective

regression testing

"Regression testing is essential before every release."

adjective

regression bugs

"The team spent three hours fixing regression bugs."

Often used with

introduce a regressionto accidentally create a bug through code changes

catch a regressionto find or detect a regression, usually through testing

regression testingtesting that checks if recent changes broke existing features

regression suitea collection of automated tests designed to find regressions

critical regressiona serious regression that severely impacts the product

Similar words

bugBug is more general; regression is specifically a bug caused by recent changes.

breakageBreakage is more informal and colloquial; regression is more precise.

defectDefect is formal but does not imply the change caused it, unlike regression.

Opposites

improvementfixenhancement

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your update broke the file upload feature. How do you report this?

We introduced a regression in file uploads.We need to regression the file upload system.The file upload system has regressed badly.We made a regression to the upload feature.

Complete the sentence

2. Before shipping this release, we must run full _______ to ensure we did not break anything.

Spot the mistake

3. Which sentence uses regression correctly?

The regression suite found three critical bugs before deployment.We will regression this change to prevent issues.That regression fixed the authentication problem.I need to regression the entire database.

Rewrite naturally

4. Rewrite this using regression: 'Our new code broke something that was working before and now customers cannot log in.'

Questions

Quick poll

Have you said "regression" in a standup this week?

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