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keep track▼(monitor)
verb

monitor [monitored, monitoring, monitors]▼(watch over, guard)
verb
[UK: ˈmɒ.nɪ.tə(r)] [US: ˈmɑː.nə.tər]

track [tracked, tracking, tracks]▼(to observe the (measured) state of an object over time)
verb
[UK: træk] [US: ˈtræk]

track down▼(to search, hunt)
verb
[UK: træk daʊn] [US: ˈtræk ˈdaʊn]