- on the road to recovery
- of one's own choosing
- out of puff
- overruling
- obesity corpulence
- or so
- once upon a time
- orb-shaped
- other man
- overgrown
- of means
- oddly
- of a piece
- obliteration
- overmuch
- odd bod
- originate in
- on the brink of
- one's kip
- of easy virtue
- overset
- on the same wavelength
- on full alert
- of substance
- one-on-one
- ordinal number
- on one's last legs
- on pins and needles
- on the barrelhead
- ovenproof
- owners
- opress
- on the qui vive
- overplayed
- old stager
- objecting
- on the doorstep
- offentimes
- one's cross to bear
- out of humour
- overdose
- obsecration
- of importance
- ordinances
- or thereabouts
- over-wrought
- overcrowd
- overfamiliar
- on welfare
- old lag
- overlooked
- over-brim
- open to attack
- osculation
- overacted
- odiousness
- on the stocks
- on the outs
- other than
- over-critical
- oblate
- overemphasized
- overkill
- old wives' tales
- over-dramatized
- outside of
- on the stroke of something
- over and above that
- out of sort
- one's salad days
- of good report
- overwight
- owner-occupancy
- of consequence
- obligingly
- offprint
- on the skew
- on the wallaby track
- olde worlde
- occurrences
- offcuts
- on the blink
- outer limits
- overhadow
- oojamaflip
- one's portion
- off target
- out-of-towner
- on the go
- out of true
- over the fence
- overload oneself
- on the way out
- overpopulated
- oddball
- out of love
- of no fixed address
- overman
- owner-occupier
- on the fritz