Prepositions as Prefixes in Adjective

 back-up—reserve
There is a back-up crew in case you need help. 

 bygone—past
In bygone days, the pace of life was slower.

downbeat—unhappy
He has been downbeat ever since his girlfriend left town. 

for-profit—money-making
That group looks like a charity, but it is really a for-profit operation.

in-class—activity done in the classroom, rather than as homework
We have to write an in-class composition.                                           

 incoming—being received
The incoming mail should go in that pile.          

 off-color—obscene
I really hate his off-color remarks.           

 offshore—in the ocean or sea
They are trying to regulate the offshore drilling of oil.           

 off-the-cuff—spontaneous
Her off-the-cuff remarks prove her to be very well informed.            

 ongoing—currently in progress
Everyone is sick of the long ongoing investigation.                     

 on-line—pertaining to the Internet
On-line services get better every day.           

 outgoing—extroverted
He is one of the most outgoing young people I have ever met.           

 out-of-the-way—far away, and not on the main road
He proposed to her at a romantic, out-of-the-way restaurant.            

 overdone—ruined from cooking too long
The dinner wasn't good; the meat was raw and the vegetables were overdone.           

 overextended—too busy
Her life is very stressful because of her overextended schedule.            

 overjoyed—very happy
He was overjoyed when he heard the news.                     

 overpaid—receiving more money than one is worth
The organization has a few overpaid employees.             

 overbearing—domineering
Life is stressful when you have an overbearing boss.           

 underdone—not cooked long enough
The meat was underdone, so we put it back in the over.           

 underpaid—paid less than one is worth
The workers at that factory are underpaid.           

 upbeat—in a good mood
Everybody is upbeat because of the holidays.         

 upmarket—stylish and expensive
The new mall has only upmarket shops; there are no discount stores there.            

 In the following expressions, prepositions are used in the form of adjectives:         

 the down side—the negative aspect
The down side of my new job is that I have to work on Saturdays.           

 the inside story—information known only by the people concerned
The tabloid newspapers always claim to have the inside story, but it is usually only speculation.           
  

 the in crowd/thing/place—what is currently popular
In high school, she was always part of the in crowd.
Body piercing was the in thing in the early nineties.
That nightclub is the in place for the over-thirty crowd.             

 the up side—the positive aspect
The up side of the new job is that there will be a lot of international travel.