Keep track of is a phrase that is used to describe the act of monitoring and recording something over a period of TIME. The crossword solutions for this phrase are MONITOR (7 letters), EYE (3 letters), and TIME (4 letters). MONITOR means to observe and check on something regularly, EYE means to watch or look at something carefully, and TIME means a period of duration. Therefore, the phrase keep track of can be interpreted as watching, looking at, and recording something over a period of TIME.