1. to study excessively or beyond what is necessary or healthy
Usage: transitive or intransitive; often implies negative consequences such as fatigue or burnout

Examples

• She tends to overstudy before exams, which leaves her exhausted.
• Don't overstudy the night before the test; you need rest.
• He overstu­died the material so much that he confused himself.
• Students who overstudy often experience stress and anxiety.
• It's possible to overstudy and still not retain the information effectively.