sitter  
noun [ C ] uk/ˈsɪt.ər/ us/ˈsɪt̬.ɚ/
  (PERSON)       
  摆姿势让人画像的模特,被画像者
someone who is having their portrait painted
  保姆(同 babysitter)
a  babysitter 
   (MISSED GOAL)      
 (足球比賽中)被错失的必进球
in football, an easy opportunity to score a goal that a player misses
  In the 90th minute, Fox missed a sitter. 比赛进行到90分钟,福克斯错失了一个必进球。