definition of
fill in

[1] #1 fill in v. supply with information on a specific topic; "He filled me in on the latest developments". wn

[2] #2 fill in v. represent the effect of shade or shadow on. wn

[3] #3 fill in v. 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". wn

[4] #4 fill in v. write all the required information onto a form; "fill out this questionnaire, please!"; "make out a form". wn