As they only had a few minutes to get to the station, they ran all the way and finally caught the train by the skin of their teeth. (*) just in time (*) just for time (*) just on time (*) just by time
This is a companion discussion topic for the original entry at https://english.best/questions/23544,as-they-only-had-a-few-minutes-to-get-to-the-station-they-ran-all-the-way-and-finally-caught-the-train-uby-the-skin-of-their-teethu/