From Longman Dictionary of Contemporary Englishfill in phrasal verb1 documentWRITE fill something ↔ in to write all the necessary information on an official document, form etc Don’t forget to fill in your boarding cards.2 tell somebody news fill somebody ↔ inTELL to tell someone about recent events, especially because they have been away from a placefill somebody ↔ in on I think you’d better fill me in on what’s been happening.3 crack/holeREPAIR fill something ↔ in to put a substance into a hole, crack etc so it is completely full and level4 SPEND TIME fill in time to spend time doing something unimportant because you are waiting for something to happen She flipped through a magazine to fill in the time.5 spaceDRAW fill something ↔ in to paint or draw over the space inside a shape6 do somebody’s jobJOB/WORK to do someone’s job because they are not there for I’m filling in for Joe for a few days. → fill→ See Verb table
Examples from the Corpusfill on• But then I forgot about it, as Jim and I began to fill him in on business here.• Finally, can some one fill me in on Carl Shutt.• As Hannah busied herself with puzzles for a few minutes, her parents filled me in on her infancy and early childhood.• Richard filled me in on his background, an oral resume as application for the position of prospective boyfriend.• Huong's friends filled me in on the ecstasy use.• Iain filled me in on the essential details while I was devouring that gargantuan breakfast.• His parents, Cindy and George Watson, filled me in on the family background.• He looked around for some one who would fill him in on the gossip.fill in time• Evening Today I had four baths to fill in time and I invented you.• Tip-top young fellow, filling in time before Cambridge.• Recreational reading can be defined as a pastime by which the reader fills in time pleasantly.fill for• Together, they wrote up more orders than the people they were filling in for.• Design a chart the parents can fill in for a period of one week.• But he has done a great job filling in for Andre Reed.• His sons fill in for him at others.• Heaston had been recruited by coach Dan Hawkins to fill in for injured starting kicker Gordon Thomson.• Brad Johnson, filling in for the injured Warren Moon, completed three short passes. fill-inˈfill-in noun [singular] British English informal BEsomeone who does someone else’s job because that person is not there SYN stand-in I’m here as a fill-in while Robert’s away.
Examples from the Corpusfill-in• Also, make sure that you improvise variations on the fill-ins at the end of each two bar phrase.• Hahn is scheduled to announce tonight's game as a fill-in for Joe Starkey.• Royston-Cambridge and Watford-St Albans fill-in schemes were also approved.From Longman Business Dictionaryfill something → in phrasal verb [transitive] to write all the information that is requested on an official formSYNFILL OUTHe filled in the usual trader’s form offering to sell the car to the finance company.The time sheet is filled in by your supervisor. → fill→ See Verb tablefill-inˈfill-in noun [countable] informal a person who does another person’s job for a short period of time, because the other person is not thereI was just a fill-in when she wasn’t available.