drop in (one's) tracks
1. To die suddenly. Brett always seemed so healthy—I'm shocked that he dropped in his tracks at 55.
2. To collapse, as from over-exertion. I hardly remember the end of the marathon because I dropped in my tracks as soon as I crossed the finish line.
drop in one's tracks
1. to collapse from exhaustion. I was so tired, I dropped in my tracks. Kelly almost dropped in her tracks from overwork.
2. to die instantly. Finally, one day, he worked so hard that he dropped in his tracks. I know that someday I will just drop in my tracks.