fill in
phrasal verb with fill verb [ T ] uk/fɪl/ us
[ 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.