- on benefit
- on sale
- on the ground
- on the wrong track
- orderliness
- one's pit
- on the verge of
- out of tune
- obscurely
- opt or plumb for
- outplay
- of concern
- overprotectiveness
- overrunning
- over-whelm
- obsessive-compulsive
- old-timer
- object to
- on the lam
- on the contrary
- object of virtu
- obtained
- overfill
- one's advanced years
- old boot
- outrageously
- offish
- originate from
- of service
- on the q.t
- obstructions
- outfox
- on holiday
- on occasions
- ovoid
- overhauling
- on guard
- on one's feet
- of old
- on tenterhooks
- on dit
- opened out
- obovate
- over indulge
- one's time of the month
- opt for
- of little merit
- of the same standard as
- occultist
- on one's toes
- old salt
- offences
- ottoman
- on the doorstep of
- open-pit mine
- oyster mushroom
- old fangled
- over-dramatize
- out of danger
- oil painting
- one-liner
- obscured
- offices
- of means
- out of puff
- overprotective
- on second thoughts
- or so
- of one's own choosing
- overgrown
- of no use
- oddly
- obliteration
- of easy virtue
- on the brink of
- oversized
- off-centre
- outbursts
- on the bread line
- off-the-cuff
- out of keeping
- on the dole
- on leave
- order to
- odd bod
- one's kip
- opine. aver
- omphalos
- off the beaten track
- of interest
- orb-shaped
- oaths
- of a piece
- overmuch
- originate in
- on the job
- on the bottom
- occultism
- on the road to recovery
- obesity corpulence