Synonyms of fill in

Noun

1. stand-in, substitute, relief, reliever, backup, backup man, fill-in, peer, equal, match, compeer

usage: 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"

Verb

1. fill in, inform

usage: supply with information on a specific topic; "He filled me in on the latest developments"

2. shade, fill in, draw, paint

usage: represent the effect of shade or shadow on

3. substitute, sub, stand in, fill in, exchange, change, interchange

usage: be a substitute; "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream--we are on a strict diet"

4. complete, fill out, fill in, make out

usage: write all the required information onto a form; "fill out this questionnaire, please!"; "make out a form"