- on the road to recovery
- oversized
- outlawing
- one's declining years
- outbursts
- obeying
- out of puff
- of no use
- obliteration
- one's kip
- of one's own choosing
- on the dole
- on the brink of
- odd bod
- out of keeping
- on second thoughts
- overgrown
- overprotective
- order to
- off-the-cuff
- one's cross to bear
- overdose
- old stager
- owners
- overplayed
- on the same wavelength
- ordinances
- objecting
- or thereabouts
- out of humour
- ovenproof
- over-wrought
- on the qui vive
- opress
- overacted
- overfamiliar
- odiousness
- old lag
- osculation
- oblate
- on the stocks
- ordinal number
- one-on-one
- on pins and needles
- on one's last legs
- on full alert
- overlooked
- obsecration
- on welfare
- of importance
- over-brim
- on the barrelhead
- overset
- on the outs
- other than
- of substance
- offentimes
- on the doorstep
- over-critical
- open to attack
- overcrowd
- one's salad days
- on the stroke of something
- on the skew
- out of sort
- obligingly
- out-of-towner
- overwight
- offcuts
- over-dramatized
- overkill
- overemphasized
- of good report
- old wives' tales
- off target
- over and above that
- outer limits
- outside of
- of consequence
- owner-occupancy
- one's portion
- occurrences
- on the wallaby track
- oojamaflip
- offprint
- on the blink
- overhadow
- olde worlde
- outer limit
- over the fence
- on the way out
- out of true
- oil the wheels of
- oppo. china
- overman
- oddball
- out of step with
- on the fritz
- oldie
- once-over