set about:  We set about cleaning up the whole house after the flood. (To begin to deal with something)
set about:  The police set about gathering evidence in the house where the murder took place. (To start to do something in a determined way)
set about:  The gang set about him with their punches. (To attack someone)

set against:  The increases in our salaries have to be set against the rising cost of living. (To offset something against another)

set against:  The dispute over inheritance has set sibling against sibling. (To cause someone to be in conflict with another)

set apart:  It is her diligence in her studies that sets her apart from her siblings. (To display a quality that separates someone from other people)

set aside:  Every month we set aside a portion of our salaries for the purchase of a house. (To reserve something for a particular purpose)

set aside:  We set aside an hour each day to do the yoga together. (To reserve something for a particular purpose)
set aside:  The High Court set aside his conviction. (To declare invalid)
set aside:  We are going to persuade the two sides to set aside their differences. (To reconcile)

set back:  The raining season will set back the completion of the building project. (To delay the progress of something)

set back:  The house renovation has set us back quite a bit. (To cost considerably)

set by:  We must set money by in case it is urgently needed sometime in the future. (To keep something for future use) 

set down:  I woke up and set down in detail the dream I just had. (To record in writing)

set down:  The taxi driver set us down at a wrong cinema. (To let someone get out of a vehicle)

set forth:  Together, they set forth for an unknown destination. (To begin a journey)

set forth:  She set forth her ideas of controlling human mind in her latest book. (To express in writing)

set in:  Global warming has set in and with it more problems will arise. (To begin to happen and seem likely to continue)

set off:  A police spokesman said the bomb was set off using a remote control. (To cause (bomb) to explode)

set off:  To ensure maximum security, any little noise can set off the alarm. ((To cause (alarm) to go off)
set off:  The family is setting off for the Far East. (To begin a journey)
set off:  An angry argument between rival fans set off a violent disturbance. (To cause to happen)

set on:  He has vicious dogs ready to be set on those who trespass on his property. (To use an animal or get someone to attack someone else)

set on/upon:  He was set upon while walking home alone. (To be violently attacked)

set out:  The brothers set out on a journey across central Asia. (To start a journey)

set out:  Police investigations revealed she deliberately set out to murder her husband’s lover. (To intend to do something)
set out:  They set out as a group to uncover the truth about the haunted castle. (To undertake to do something)
set out:  Every evening along the street, the traders set out their wares for sale. (To arrange and display for sale, exhibition, etc)
set out:  He set out to break the world’s record of becoming the oldest bullfighter. (To aim or attempt to do something)
set out:  The document set out clear guidelines on the use of chemicals in food production. (To specify precisely about something)

set to:  We set to, and completed the work well before the deadline. (To begin doing something in a vigorous and determined way)

set up:  Jack and Jill have set up a business selling rabbit food. (To establish a business, organization, institution, etc)

set up:  They set up an investment fund to provide money for their retirement. (To establish)
set up:  Owning highly successful businesses has set the father and son up for life. (To be provided with enough money to last one’s lifetime)
set up:  A good sleep has set him up for the day of long distance driving. (To give someone the health or energy needed to do something)
set up:  He claimed he was set up when customs officers discovered some drug in his bag. (To make someone who is innocent seem guilty)
set up:  He sets himself up as a leading authority on termites. (To lay claim to being a particular person)
set up:  Following the escape of a prisoner, police set up road blocks round the surrounding area. (To erect something)
set up:  The company is setting up a new system of stock control in the new year. (To organize and implement something)

settle down:  She hopes to settle down before the age of 30, and have a family. (To start to live a steady life)

settle down:  He felt he wasn’t yet ready to settle down. (To start to live a steady life)
settle down:  She settled down for a quiet doze on the sofa. (To become composed)
settle down:  It didn’t take her long to settle down in her new office environment. (To adapt)

settle for:  The dress of her favourite colour is out of stock, and she settled for a blue one. (To accept something that is less than the exact thing that you want)

settle for:  They were prepared to settle for a draw, knowing that their opponent was very difficult to play against. (To accept less than what you really want)

settle in/into:  The kids settled happily into their new school. (To become used to a place) 

settle on:  They have not settled on the date for their marriage. (To decide or agree on something)

settle on:  He drew up a will to settle a yearly sum on each of his children. (To transfer money or property to someone)

settle up:  Let’s settle up and leave this bar for supper. (To pay money owed or due)

shoot down:  The rebels shot down a few villagers who they claimed were government agents. (To kill or injure someone by firing a gun at them)

shoot down:  Our antiaircraft gun shot down six enemy aircraft. (To bring down something by shooting it)
shoot down:  The proposal was unanimously shot down in the meeting. (To strongly oppose)

shoot for:  The team is training hard as it shoots for a place in the final stage. (To strive for a goal)

shoot off:  The rival gang members stopped the fight and shot off when informed that the police were approaching. (To run quickly away)
shoot out: The bank guards and the armed robbers shot it out in front of the bank. (To shoot at each other)

shoot up:  Prices of most kinds of baby food have shot up. (To increase sharply)

shoot up:  Their children have shot up and are now taller then their parents. (To grow quickly in size, height, etc)
shoot up:  That the house was severely shot up was clearly evident as its walls were heavily riddled with bullet holes. (To be full of bullet holes)
shoot up:  They would often gathered together in the abandoned house to shoot up. (To introduce a drug into the body with a hypodermic syringe)