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English definition of “fill in”

fill in

phrasal verb with fill     /fɪl/ verb [T]
[T] to write or type information on a document in spaces that are provided for it: Companies will encourage customers to fill in questionnaires about themselves. Please print off a copy of the agreement , fill it in, sign it and send it back.
[I] to do the work of someone else for a short time : fill in for sb I asked Agnes to fill in for me while I went for lunch . When you're off sick , someone else has to fill in.
[T] to tell someone something they do not know , especially something that happened when they were not there: I haven't seen the latest report , so perhaps you could fill me in?fill sb in on sth Josh filled me in on what had been agreed at the meeting .
(Definition of fill in from the Cambridge Business English Dictionary © Cambridge University Press)
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