The term 'keep tabs on' is an idiom that means to closely observe or MONITOR something. This can be done in a variety of ways, such as tracking, monitoring, tending, watching, eyeing, overseeing, tailing, or spying. Each of these words can be used to describe the action of keeping tabs on something. Tracking involves following the progress of something over time, while monitoring is the act of observing something regularly. Tending is the act of taking care of something, while watching is the act of paying attention to something. Eyeing is the act of looking at something carefully, while overseeing is the act of supervising something. Tailing is the act of following someone, and spying is the act of secretly observing someone. All of these words can be used to describe the action of keeping tabs on something.