名詞 fill-in:

1. someone who takes the place of another (as when things get dangerous or difficult)
   同義詞：stand-in, substitute, relief, reliever, backup, backup man

動詞 fill-in:

1. supply with information on a specific topic
   同義詞：fill in
2. represent the effect of shade or shadow on
   同義詞：shade, fill in
3. be a substitute
   同義詞：substitute, sub, stand in, fill in
4. write all the required information onto a form
   同義詞：complete, fill out, fill in, make out

fill-in

n.Informal （名詞）【非正式用語】
One that serves as a substitute for another.
補(bǔ)缺者：代替另一人的人
A short, informative summary.
摘要，總結(jié)：精煉且信息量大的總結(jié)