1
general::
Phrase(s): keep track (of someone or something)
Go to keep tab(s) (on someone or something).
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Remain informed, follow the course of, as in Are you keeping track of the time? This usage alludes to following a literal track, as of footsteps. The antonym, lose track, alludes to straying or wandering from a track, as in I've lost track? what day are you leaving? [Late 1800s]
American Heritage Idioms