fill in

verbs

supply with information on a specific topic
"He filled me in on the latest developments"
fill in
is a type of (narrower)
impart knowledge of some fact, state or affairs, or event to
"I informed him of his rights"
inform
represent the effect of shade or shadow on
fill in, shade
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"
fill in, stand in, sub, substitute
is derived from
fill-in
write all the required information onto a form
"fill out this questionnaire, please!"; "make out a form"
complete, fill in, fill out, make out