Duck Test
Noun · Slang & Abbreviations
Definitions
An informal heuristic captured by the idea that if something looks and behaves like a duck, it is probably a duck. Engineers use it when pattern recognition is more practical than perfect proof.
In plain English: A common-sense test where something is judged by how much it looks like the thing.
Example: "It passes the duck test for a cache stampede even if we haven't traced every request yet."