- old dear
- overhand
- outpatient
- one's own
- of immeasurable value
- occurring
- on that occasion
- old master
- open-endedness
- oncosts
- orbicular
- on the lookout for
- one's Ps and Qs
- over-scrupulousness
- on the bush telegraph
- ovule
- oblivious to
- of a mind
- open-ended
- ode
- occurring each day
- outvote
- operating
- oubliette
- one day
- on the shore
- onions
- of no moment
- on an equal footing
- on the slate
- overcurious
- ordination
- on the block
- of immeasurable worth
- of the cuff
- obtrude on
- off-course
- outfits
- overwrite
- of age
- ordered
- owing someone a debt of gratitude
- on numerous occasions
- out of harm's way
- on dry land
- on level with
- open-work
- open for discussion
- obliviousness
- outturn
- one-sidedness
- one's lot in life
- Ozalid
- overlord
- on the verge of tears
- one's marching orders
- oviform
- obiter dictum
- or rather
- overspend
- opponents
- occupy oneself
- oiled
- observation of
- outmost
- off the latch
- overarching
- officers of the law
- of a kind
- opposers
- of assistance
- over-sensational
- ocean-going
- obligated to
- outcrop
- obtrusion
- Old Nick
- one after another
- old fashioned
- overfull
- on end
- oatmeal
- outreach
- off drugs
- others
- owing to the fact that
- operating costs
- old warhorse
- over-elaborateness
- okey-dokey
- of one voice
- on top of that
- overzealous
- on vacation
- outstretch
- old boy
- open to change
- other side of the coin
- outflux
- over-appreciative