What is time to time?

Time to time means periodically or regularly, usually at intervals that are not fixed or equal. It suggests that something happens repeatedly but not on a set schedule. For example, a person may check his email time to time throughout the day, meaning that he checks it periodically but not at set intervals. Similarly, a company may organize team-building exercises time to time, indicating that such activities are held on a semi-regular basis but not necessarily every week or month. The phrase can be used in a variety of contexts to describe events or actions that occur intermittently over time.