pro-am 
(prōăm′)
(prōăm′)n.
A sports event, such as a golf tournament, in which professionals compete with or against amateurs.
[PRO(FESSIONAL) + AM(ATEUR).]
pro-am′ adj.
- off-the-grid
- off the ground
- off the hook
- off-the-rack
- off the rack
- off-the-record
- off the record
- off-the-shelf
- off the shelf
- off the top of head
- off the top of (one's) head
- off the top of one's head
- off the wagon
- off-the-wall
- off the wall
- off the wind
- off-track
- off-track betting
- off-white
- off year
- O'Flaherty
- of late
- ofloxacin
- OFM
- of necessity