A comer is anyone who wants to join in — above all a race, a match, or some other contest. You almost always meet it in the phrase all comers: a race open to all comers will take whoever shows up and wants to try, not only club members or famous names.

A comer comer is anyone who wants to join in是任何想要加入的人 — above all尤其是想加入 a race一場比賽, a match一場對決, or some other contest或其他某種競賽。You你 almost always meet it幾乎都會看到它 in the phrase all comers在all comers這個片語裡: a race open to all comers a race open to all comers（意思是這場比賽） will take whoever shows up and wants to try誰想來、誰想試都可以參加, not only club members or famous names不只限於俱樂部成員或知名人士。

It belongs more to sports writing and notices than to everyday chat; with friends people just say “anyone can enter.” Though actually, American English also uses a comer for a person on the way up, a talent worth watching. That is a looser, later stretch of the same pieces.

It它 belongs more to sports writing and notices比較屬於體育報導和公告的用語 than to everyday chat不太用在日常聊天裡; with friends朋友之間 people just say會直接說 "anyone can enter."「anyone can enter」。Though actually不過其實, American English美式英文 also uses a comer也會用a comer for a person on the way up來指一個正在崛起的人, a talent worth watching值得關注的人才。That那 is a looser, later stretch of the same pieces是同樣的組成成分後來衍生出的、比較鬆散的用法。

This meaning is the older, plainer one: a person who comes to take part.

This meaning這個意思 is the older, plainer one才是比較古老、比較直白的那個: a person who comes to take part一個來參加的人。