when you have seen one, you have seen them all
Proposed by a contributor, not yet supported by evidence.
Meaning · English
Things that seem different are actually very similar
Where it’s used:
Used
Widespread English
Sources & notes
Listed on Wikipedia “List of proverbial phrases” (CC BY-SA 4.0, 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 2026-07-30; pending editor spot-check.
Common questions
What does “when you have seen one, you have seen them all” mean?
Things that seem different are actually very similar
Is “when you have seen one, you have seen them all” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.