From Longman Dictionary of Contemporary Englishobject lessonobject lessonTEACHan event or story that shows you the right or wrong way of doing somethingobject lesson in The way ants work is an object lesson in order and organization. → object
Examples from the Corpus
object in• The regimented society of social insects such as ants and bees is an object lesson in order and organization.• Its history is an object lesson in natural selection.• And the ride is an object lesson in suppleness and elimination of vibration.• The series is an object lesson in, among many other qualities, the differences of gaze.• The highly sophisticated broadcasting industry offers an object lesson in the inadequacy of current standards of measuring public behavior.• It was an object lesson in how to protect a lead.• The parched remnants were, for Roosevelt, a stark object lesson in the need for animal protection.• She was spared the trauma of dinner, the object lesson in human dignity, and the smoke of Revolution. 