Also found in: Dictionary, Thesaurus, Medical, Legal, Encyclopedia.
lose track of (someone or something)
1. To lose visibility of, forget about, misplace, or neglect to pay close attention to something. I'm sorry I'm late—we were having so much fun that I completely lost track of time. Do you know what time the party starts? I've lost track of my invitation. I was watching the bird through my binoculars until I lost track of it in the canopy.
2. To unintentionally decrease frequency of communication with someone over time until no further contact takes place. Unfortunately, I lost track of my college roommate, so I have no idea how she's doing now.
lose track (of someone or something)
to lose contact with someone; to forget where something is. I lost track of all my friends from high school. Tom has lost track of his glasses again.
see under keep track.