to search for a person or animal by following the marks they leave behind them on the ground, their smell etc:
Police have been tracking the four criminals all over Central America.
track somebody to something
The dogs tracked the wolf to its lair.
to record or study the behaviour or development of someone or something over time:
The progress of each student is tracked by computer.
to follow the movements of an aircraft or ship by using radar:
a tracking station
to move a film or television camera away from or towards a scene in order to follow the action that you are recording
camera[intransitive + in/out]TCB
to put schoolchildren in groups according to their ability [= stream British English]
school[transitive] American EnglishSES
to leave behind a track of something such as mud or dirt when you walk:
mark[transitive] American English
Which of you boys tracked mud all over the kitchen floor?
track somebody/something ↔ downphrasal verb
I finally managed to track down the book you wanted in a shop near the station.
Detectives had tracked her down in California.