overpunish means to punish excessively; to issue a punishment that is harsher than necessary.
Etymology
From over- + punish.
verb
- To punish excessively; to issue a punishment that is harsher than necessary.“After each one of the two cards has been presented, the overpunished child will invariably say that the father (or mother) is going to hit the child with a belt, or fist, or some other implement; the child will feel bad; the child will be mad at the parent; and the child will want to run away, or less commonly, want to strike the parent back.”