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track someone or something down
to search out where someone or something is. I don't know where Anne is. I'll try to track her down. I'll track down Anne for you.
track down somebody/somethingalso track somebody/something down
to find someone or something after searching for them I'm trying to track down one of my old classmates from college. My library assistant tracked down several references for me My mother wanted to find the family who had taken care of my father during the war, and somehow she was able to track them down.
Follow successfully, locate, as in I've been trying to track down that book but haven't had any luck. This term alludes to the literal use of track, "follow the footsteps of." [Second half of 1800s]
To pursue someone or something until found or captured: I tracked down the book I was looking for. The fugitives were missing for a month before the police tracked them down.