- on one's feet
- on the doorstep of
- overhauling
- of service
- ottoman
- on guard
- oil painting
- of old
- on dit
- old salt
- on holiday
- on occasions
- over-dramatize
- on one's toes
- opt for
- overprotectiveness
- outplay
- outfox
- one's pit
- on the wrong track
- outrageously
- on the ground
- on sale
- ovoid
- originate from
- offish
- orderliness
- of concern
- of the same standard as
- overrunning
- over-whelm
- on benefit
- old boot
- old-timer
- on the lam
- obtained
- overfill
- object of virtu
- on the contrary
- object to
- on tenterhooks
- old fangled
- obstructions
- offices
- out of danger
- obscurely
- obsessive-compulsive
- occultist
- oyster mushroom
- open-pit mine
- one's time of the month
- on the verge of
- one's advanced years
- obovate
- opt or plumb for
- offences
- obscured
- out of tune
- one-liner
- over indulge
- on the q.t
- opened out
- of little merit
- out of puff
- overgrown
- originate in
- on the dole
- overruling
- on the bottom
- opposer
- oddly
- offcomer
- off-the-cuff
- odd bod
- of a piece
- of no use
- overmuch
- obliteration
- on the brink of
- over-peopled
- obesity
- opine. aver
- over-bearing
- of easy virtue
- orders
- oversized
- on remand
- one's declining years
- outlawed
- outlawing
- of one's own choosing
- oxidize
- on leave
- out of keeping
- omphalos
- obstructed
- once upon a time
- obesity corpulence
- off the beaten track
- or so