DICT.TW Dictionary Taiwan

 fill-in /ˈfɪlˌɪn/
 臨時填補空缺的人,臨時填補物(a.)臨時填補性的

 fill-in
      n : someone who takes the place of another (as when things get
          dangerous or difficult); "the star had a stand-in for
          dangerous scenes"; "we need extra employees for summer
          fill-ins" [syn: stand-in, substitute, relief, reliever,
           backup, backup man]