坐著讓人畫、讓人拍的人
這是最貼近字面的一支：人真的坐在那裡不動。核心畫面幾乎不用轉換就直接拿來用。
noun · B2
The person who sits or stands still while an artist paints or draws them, or while a photographer takes their picture.
肖像模特兒
核心畫面
A sitter can be thought of as the one that stays put while everything else moves. Someone holds a pose in a chair so a painter can work. Someone stays in the house with the children while the parents go out. A ball stops in front of an open goal and waits to be kicked. In each case the word points at whoever, or whatever, is staying in place.
sitter 可以想成「留在原位的那一個」。有人坐在椅子上不動，讓畫家慢慢畫。有人留在家裡陪小孩，等爸媽回來。球停在…更多收起
sitter 可以想成「留在原位的那一個」。有人坐在椅子上不動，讓畫家慢慢畫。有人留在家裡陪小孩，等爸媽回來。球停在球門前面，等著被踢進去。周圍都在動的時候，這個字指的就是待在那裡不走的那一個。From the word’s history
Wiktionary records sitter as Middle English sitter, sittere, that is sit plus -er: one who sits.
Wiktionary 記錄 sitter 來自中古英語的 sitter、sittere，等於 sit 加上 -er，也就是「坐著的那個人」。這條線索和上面的畫面接得上。
Wiktionary (kaikki extract, entry sitter/noun): "From Middle English sitter, sittere, syttare, equivalent to sit + -er."
Three branches
留下來陪著、顧著的人
把「留在原位」從一個姿勢擴大成一段任務：人留在那個地方，直到該回來的人回來。
noun · B1
Someone who stays with a child and looks after them for a few hours while the parents are out, usually for pay. It is the short form of babysitter.
臨時保母
停在那裡等人打的球（運動俚語）
這一支把「留在原位」的主角從人換成球，畫面本身沒變：東西停著，等你來處理。
noun · C1
In sports such as football, snooker and cricket: a chance to score that is so easy that the player is expected to take it. It is slang, and it is used most often when the player misses.
超簡單的得分機會