set your heart on something | have your heart set on somethingidiomPart ofheartset your heart on something | have your heart set on somethingset your heart on something | have your heart set on something — idiomidiom1. To want something very much and be determined to get it.1.idiomDefinitionTo want something very much and be determined to get it.ExampleShe has her heart set on becoming a doctor.He set his heart on winning the championship.