Tolling a statute of limitations occurs when a time period during which a statute of limitations for bringing a specific type of legal action is temporarily stopped from running.
For example, many states have statutes that toll the statute of limitations for an accrued negligence claim belonging to a child while the child is still a minor. That means that, for up to 18 years, the 2-year statute of limitations on negligence claims, which otherwise would have long since run out, is stopped from running. When the child reaches age 18, the 2-year statute of limitation period begins to run at that point, and the plaintiff has until they reach age 20 to file suit.