Keep time is a phrase used to describe the act of keeping track of time, usually through the use of a clock or watch. The two crossword solutions for this phrase are RENEW (5 letters) and TAP (3 letters). RENEW can be used to refer to the act of refreshing or restoring something, which could be interpreted as resetting a clock or watch to keep time. TAP can be used to refer to the act of tapping a clock or watch to keep time, such as when setting an alarm.