The scenario you described, where a child gets scolded by a teacher in class and then returns home to show anger to his/her parents, is an example of "displacement" in psychology.
Displacement is a defense mechanism that involves redirecting one's emotions, such as anger or frustration, from the original source of those emotions onto a substitute target that is perceived as less threatening or safer. In this case, the child may feel upset, hurt, or humiliated by the teacher's scolding but might not feel comfortable expressing those emotions directly to the teacher. Instead, the child displaces those feelings onto the parents, who are seen as a safer and more approachable target.
Displacement can be a way for individuals, including children, to cope with difficult emotions when they feel unable to express them directly to the source or when they fear negative consequences from doing so. As a defense mechanism, it serves to protect the person from the more intense emotions associated with the original situation.
In such situations, it is important for parents to be understanding and empathetic toward their child's feelings. Encouraging open communication and providing a supportive environment can help the child express their emotions more effectively and cope with the experiences at school in a healthy manner.