day boy 
noun British
A boy who lives at home but attends a school where other pupils board.I shared my large room with Andy, a day boy, and so had the place to myself at night....
- He himself had attended the school and recalled that there were 82 pupils there at the time, all boarders except one day boy, and one lay teacher.
- In those days it was still a boarding school, though half were day boys from local neighbourhoods like myself.
- do someone an injustice
- do someone a solid
- do someone credit (or do credit to someone)
- do someone dirt (also do dirt to)
- do someone fine
- do someone good
- do someone in
- do someone no favours
- do someone (or oneself) a mischief
- do someone out of
- do someone over
- do someone proud
- do someone's head in
- do someone/thing a power of good
- do someone/thing down
- do someone/thing justice
- do someone to death
- do someone up
- do someone wrong
- do something for one's country (or England etc.)
- do something in
- do something (or nothing) for
- do something out
- do something over
- do something to death