- on the decline
- oversimple
- on every occasion
- ostensible reason
- obbligato
- of prey
- overabun-dance
- ostentatiousness
- organisation
- overtures
- on course
- one-to-one
- ousting
- opening remarks
- occidental
- on one side
- old-age pensioners
- outrush rush
- outfitted
- olive-skinned
- offensiveness
- other side
- one's cup of tea
- out of the spotlight
- omnivo-rant
- out of sight
- ominousness
- open to the elements
- optic
- oilskin
- of one's on volition
- occupants
- on the way up
- off course
- of incalculable value
- of considerable importance
- out-spoken
- on bad terms
- on the edge
- open to discussion
- ozone-friendly
- opportunity to purchase
- outstretched
- objectless
- outrigger
- offer a prayer
- over-elaborate
- order around
- open on to
- overpass
- of current interest
- over-hastily
- one-rous
- overtax
- outward show
- overfeed
- opposite number
- own particular
- on the edge of
- occur in turn
- of unknown name
- on the run
- open to question
- of itself
- olden
- out dated
- out for revenge
- olive black
- omnibus
- order someone around
- over-enthusiastic
- overextend
- offer condolences to
- one and only
- off track
- osmosis
- on the way to
- over-decorated
- overeating
- obsession with
- of higher quality
- one single time
- oblational
- open to debate
- obligated
- of low intelligence
- ovrthrow
- overtrusting
- old clothes
- official mark
- on a level
- occur suddenly
- on the shortlist for
- octuplets
- out of keeping with
- oral history
- of greatest importance
- off one's guard
- offen-sive
- outer ear