lessons learned
Proposed by a contributor, not yet supported by evidence.
Meaning · English
Knowledge or insights gained from experience, especially mistakes
Nghĩa · Tiếng Việt
kiến thức hoặc hiểu biết thu được từ kinh nghiệm, đặc biệt là từ sai lầm
Machine-translated — suggest a fix
Literally: learned lessons
Where it’s used:
Used
Widespread English
Examples
The team reviewed the project to document lessons learned
AI-drafted example auto-approved by rule (illustrative, not a corpus attestation)
Sources & notes
Listed in Wiktionary’s “English idioms” category (retrieved 2026-07-29); definition pending editorial review. Definition drafted by AI (@cf/meta/llama-3.3-70b-instruct-fp8-fast) and auto-approved by rule on 2026-07-31; pending editor spot-check.
Common questions
What does “lessons learned” mean?
Knowledge or insights gained from experience, especially mistakes Literally: learned lessons
Is “lessons learned” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.