fill in

Verb	1.	fill in - supply with information on a specific topic; "He filled me in on the latest developments"
	2.	fill in - represent the effect of shade or shadow on Synonyms: shade
	3.	fill in - 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" Synonyms: stand in, sub, substitute
	4.	fill in - write all the required information onto a form; "fill out this questionnaire, please!"; "make out a form" Synonyms: fill out, complete, make out

backup, backup man, change, exchange, fill-in, interchange, relief, reliever, stand in, stand-in, sub, substitute