- one-man show
- one-act play
- one who shaves
- one who enjoys
- one who creates
- one which deserves to be imitated
- one roaming
- one place
- one another
- once and for
- on view, on display
- on the tip of one's tongue
- on the strength of because of
- on the spot
- on the scent
- on the road
- off beam
- on draught
- on-the-spot
- occur simultaneously
- on time
- oral examination
- of greatest import-ance
- of around
- officials
- ovum
- one thinks fit
- omit. neglect
- over one's shoulder
- one's way into
- off disregard
- official procedure
- outfall
- out of someone drain
- obtain by threats
- overemphasis
- on any occasion
- overabundance
- odd fellow
- object on display
- of noble birth
- old horse
- on disparage
- out of devastate
- outer surface
- official paper
- oldness
- out of one's hands
- off limits
- orphaned
- overfamiliarity
- of fixed views
- orchestra musical group
- of the Middle Ages
- outdoor meal
- on exploit
- oneself lie down
- overtaxed
- on hire purchase
- out of the public eye
- outstanding amount
- on one's father's side
- on to the land
- out of favour
- out check
- on take pride in
- or else
- odd-jobber
- outdoors
- on all sides
- oversensitivity
- official communica-tion
- orphan
- objector
- over ignore
- outhouse
- on the slant
- out show
- on the same level as
- out of one's element
- opinion poll
- office worker
- on enchant
- out exclaim
- obedience to
- orgasm
- out disregard
- on shame
- over-powered
- ocular
- one more
- out of the country
- one time
- on exhibition
- on regulate
- of no fixed abode
- organizer
- on friendly terms
- obsessed with
- ordering