English definition of “track”
PATH [C] › a narrow path or road: We followed a dirt track off the main road.
RAILWAY [C] › the long metal lines which a train travels along: UK a railway track/US a railroad track
RACE [C] › a path, often circular, used for races: a race track track events
SPORT [U] US › the sport of running in races around a wide circular path made for this sport
MUSIC [C] › one song or piece of music on a CD, record, etc
keep track › to continue to know what is happening to someone or something: He changes jobs so often - I find it hard to keep track of what he's doing.
lose track › to not know what is happening to someone or something any more: I've lost track of how much we've spent.
on track › making progress and likely to succeed: [+ to do sth] A fighter from Edinburgh is on track to become world heavyweight boxing champion. We've got a lot of work to do but we're on the right track.