會去、會動的那一個（最字面）
這一支就是核心本身，沒有多加任何東西。
noun · C2
Someone or something that goes. This plain use is mostly found in older writing, and today it turns up most often in the pair comers and goers, meaning the people arriving and leaving.
去的人；會走的東西
核心畫面
Goer is go with -er on the end: the one that goes. Hold that one picture — a door standing open with something moving through it — and the rest is only a question of what kind of going you mean. Going to the same place again and again gives you cinema-goer. Going strongly and gives you a car that people call a good little goer. An old and rude piece of British slang took the same idea and pointed it at a woman's private life.
goer 可以想成 go 加上 -er：會走、會去的那一個。腦中留一個畫面就好：一扇門開著，有東西一直從那裡進出。其…更多收起
goer 可以想成 go 加上 -er：會走、會去的那一個。腦中留一個畫面就好：一扇門開著，有東西一直從那裡進出。其他意思的差別，只在「去哪裡」和「去得怎麼樣」。一直去同一個地方，就長成 cinema-goer。催得動、跑得順，就長成講車的 a good little goer。還有一支很舊的英式俚語，把同樣的「一直在動」拿去說一個女人的私生活，語氣很不客氣。From the word’s history
Wiktionary records goer as Middle English goere, simply go plus the -er ending that makes a doer out of a verb, and compares German Geher (goer, walker). So the plain agent noun really is the oldest layer here.
Wiktionary 記載 goer 來自中古英語 goere，就是 go 加上 -er 這個「做某事的人」字尾，並拿德語 Geher（走路的人）來比較。所以「會去的那一個」確實是最底下的一層，其他用法都疊在它上面。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:617454752): 'From Middle English goere, equivalent to go + -er. Compare German Geher.'
Three branches
常去某個地方的人
在 goer 前面放一個地方，就把單次的「去」變成長期的習慣。
noun · B2
Joined to the end of a word such as cinema, church, party or theatre to name a person who goes there regularly: a cinema-goer is someone who goes to the cinema often.
常去…的人（構詞用）
（舊·英式·不禮貌）說女人性關係隨便
一種幫助理解的想法是：英式口語常把 go 當成性的委婉說法，於是「一直準備好要走」被拿去說人。這只是記憶的線索，不是字源上的推導。
noun · C2
A woman who has sex with many different men. Saying this about a woman is rude and looks down on her; it is British spoken slang and now sounds very old-fashioned, so you meet it in old comedy and old novels far more than in real conversation.
（英·舊）性關係隨便的女人