The term overdo is used to indicate that someone has gone beyond a recommended or sensible limit. This word is often coupled with activities where excess can lead to undesired consequences, such as in cooking, exercising, or expressing emotions. When you overdo something, it implies that you've passed the point of optimal effect or enjoyment.

Overdue is primarily used when referring to something that is late or not completed by the expected time. It suggests a missed deadline or the past-due status of a task, bill, book, or other deliverables. The term is often employed in financial contexts, library services, and situations where there are clear time expectations.

While overdo and overdue may sound similar, their meanings are distinct. Overdo is a verb that emphasizes excessiveness in action, often leading to undesirable results. Overdue, an adjective, signals that something has not been done or occurred by its due time, compounding stress or urgency. Using these terms appropriately can help communicate different situations involving excess and delay with clarity and precision.