Focus on the pronunciation of fill in
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.