一隅三反

idiom

to infer three things from one case; to draw inferences about other cases from one instance; to learn by analogy

Derived from the Analects: 'If I show one corner and the student cannot infer the other three, I will not repeat.' The original form is '一隅三反' (yī yú sān fǎn), where '隅' means corner. Now widely used to describe the ability to generalize and apply knowledge flexibly.