1. fill-in - Noun
2. fill-in - Verb
someone who takes the place of another (as when things get dangerous or difficult)
write all the required information onto a form
supply with information on a specific topic
represent the effect of shade or shadow on
be a substitute
Source: WordNetfill in
the star had a stand-in for dangerous scenes Source: Internet
we need extra employees for summer fill-ins Source: Internet
fill out this questionnaire, please! Source: Internet
make out a form Source: Internet
He filled me in on the latest developments Source: Internet
The young teacher had to substitute for the sick colleague Source: Internet