One way to hold this word: stand in the middle of a station hall and watch. Lines of people come in from the street, down from the platforms, up from the trains below, and for a moment they are all in the same wide open space before they scatter again. Several run into one point, and the point has room to hold everything that arrives. Whether the word is naming that space, the people filling it, or two streams meeting in a field, the same running-together is underneath it.
From the word’s history
The word comes through Middle English and Middle French from Latin concursus, from concurrere, to run together — the same root as concur. The running-together is not a later metaphor; it is what the word says.
這個字經由中古英文和中古法文，來自拉丁文 concursus，源頭是 concurrere（一起跑），跟 concur 同一個字根。「跑到一起」不是後來加上去的比喻，而是這個字本來就在說的事。
Wiktionary entry for concourse, etymology_text supplied in this packet: 'From Middle English concours, from Middle French concours and its etymon Latin concursus, concursum, from concurrere (to run together). See concur.'
登入就可以看每一支怎麼連回核心畫面。