某種要應付的人物
從「要打交道的對象」這層意思延伸：店員每天面對形形色色的顧客，久了「customer」就被借去指「一個要應付、要打交道的傢伙」，常帶點難纏、麻煩的味道。
tricky person to deal with · noun · A2
A certain type of person to deal with, especially one who is difficult, tricky, or hard to handle.
傢伙 / 人物
核心畫面
You can picture someone walking up to a counter and handing over money — the person on the buying side of a deal, the one a shop or business is there to serve.
可以想成站在櫃台前、掏錢出來的那個人——交易裡「付錢」的這一邊，是店家或公司存在的目的所在。整個字的畫面就圍著「來買…更多收起
可以想成站在櫃台前、掏錢出來的那個人——交易裡「付錢」的這一邊，是店家或公司存在的目的所在。整個字的畫面就圍著「來買東西、來付費的人」打轉。From the picture
Also in this word
buyer, client · noun · A2
Someone who buys things or pays for a service from a shop, company, or business.
顧客 / 客戶
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
customernoun/ˈkʌs.tə.mə/
- 1
obsoleteA habitual patron, regular purchaser, returning client; a person or company who has a custom of buying from a particular business.
- 2
A person or company who purchases or receives a product or service from a business or merchant or intends to do so.
- Every person who passes by is a potential customer.
- Airlines are the chief customers of the commercial divisions of large-aircraft manufacturers such as Airbus, Boeing, and Embraer.
- 3
informalA person, especially one engaging in some sort of interaction with others.
- a cool customer, a tough customer, an ugly customer
- Pug could just see Slote's pale face under his fur hat. "I don't agree with you on that. He's a pretty tough customer, Hopkins."
- 4
historicalA native official who exacted customs duties.
- His houses […] are seized on by the Customer.
- The Customer should come and visit them.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。