- out of proportion to
- outflank
- oven-ready
- over and done with
- overwhelmed
- overwritten
- once-a-year
- outbuilding
- openness
- offer one's services
- overcrowding
- orthodontist
- one's notice
- of bad reputation
- Old Dart
- overempha-size
- operations
- overtiredness
- open wide
- opportunity to be heard
- of vital importance
- of ill repute
- overtime
- occa-sionally
- official residence
- object strongly to
- one only
- ophidian
- o'clock
- of benefit
- off the peg
- olive green
- on show
- on the other hand
- on the top
- open one's heart
- open to
- optical
- out of condition
- overtures
- of the day
- octuplets
- oblational
- on course
- overextend
- ovrthrow
- obbligato
- overloaded
- object of ridicule
- of greatest importance
- oilskin
- oversimplified
- on one's stomach
- on the authority of
- overambitious
- occur suddenly
- open on to
- offensiveness
- out of proportion
- outrigger
- on a level
- order someone around
- olden
- on the shortlist for
- oxen
- of itself
- on the edge
- ozone-friendly
- overfeed
- overestimate one's ability
- olive black
- over-hastily
- over and over again
- overpass
- order around
- over-elaborate
- on bad terms
- on the sly
- official opening
- of higher quality
- opposite number
- omnibus
- out in the open
- out-think
- obligated
- outfitted
- on the decline
- offer condolences to
- one single time
- onesidedness
- obsessive fear
- over-inflated
- oven-bake
- offer marriage
- out of the spotlight
- on schedule
- occur again
- over-scrupulous
- open to question
- opportunity to purchase