登門的訪客
call 早年就有「短暫拜訪」的用法（call on somebody），這一支是從那裡來的，跟電話無關。
visitor · noun · B1
someone who visits your house for a short time, especially someone you do not know well (old-fashioned).
訪客
核心畫面
Picture someone reaching you from outside — their voice on the line, or in an older world their knock at your door. English uses call for both, so caller covers both: the person on the phone, and the person paying a short visit.
可以想成：有人從外面找上門來——現在是聲音出現在電話那頭，在更早的年代則是敲你家的門。英文的 call 兩件事都用，…更多收起
可以想成：有人從外面找上門來——現在是聲音出現在電話那頭，在更早的年代則是敲你家的門。英文的 call 兩件事都用，所以 caller 也兼了兩種身分：打電話來的人，和短暫來訪的客人。今天絕大多數情況指的是前者，後者只在舊時代的敘述裡出現。From the picture
Also in this word
person making a call · noun · A2
a person who is making a telephone call.
來電者
原始詞典資料6 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。
callernoun/ˈkɔːlə/
- 1
communicationselectrical-engineeringengineeringThe person who makes a telephone call.
- ―I’ve got someone on the line. ―Who’s the caller?
- Thaler was arrested in Orono last May when a caller reported that the car she was driving had a shattered rear window and a blown-out tire.
- 2
A visitor.
- a gentleman caller
- 3
bingogamesThe person who stands at the front of the hall and announces the numbers.
- 4
computingengineeringmathematicsA function that calls another (the callee).
- If the called function throws an exception, the caller should be prepared to handle the error.
- 5
A whistle or similar item used to call foxes.
- 6
dancedancinghobbiesThe person who directs dancers in certain dances, such as American line dances and square dances.
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。