|idle away||Waste time doing nothing much.||He idles away hours every day watching television.|
|iron out||Resolve by discussion/ eliminate
|The meeting tomorrow will be an opportunity to iron out difficulties.|
|impose on/upon||Ask too much of someone.||Is it alright if I stay?
I don’t want to impose upon your hospitabity.
|improve on/upon||Make better||The runner improved on his previous performance.|
|indulge in||Allow yourself to enjoy something||I’ve been dieting all week but today I’m going to indulge in a dessert.|
|insure against||Guarantee compensation for damage etc.||The house is insured against fire.|
|invite out||Ask someone to join you for lunch, dinner, etc.||Harry invited her out for dinner.|
|join in||Participate||She was too shy to join in the game.|
|join up||1) Engage in, become a member of
2) Meet and unite with
|1) John was in the army and Tom joined up as soon as he left school.
2) The two groups of tourists joined up at the hotel.
|jot down||Take quick notes||I jotted down the address while watching the programme on TV.|