- of one's own volition
- office-holder
- order about
- once a year
- obtain by force
- of the same family
- open wide
- on top form
- one step at a time
- oesophagus
- occa-sionally
- offertory
- obsessional
- of the Dark Ages
- overwhelming majority
- out of condition
- overtiredness
- out of proportion to
- on one's head
- overempha-size
- on one occasion
- of bad reputation
- obsessed with one's health
- on the basis of
- one's notice
- overlap
- offer up
- openwork
- orthodontist
- outbuilding
- official approval
- official list
- on one' head
- on to the shore
- occur to
- on every side
- overwhelmed
- observation post
- open to the public
- open up
- on the lose
- outflank
- opposite each other
- of mixed breed
- on show
- overwritten
- on standby
- overdo it
- overstate the case
- on track
- orchestration
- officially approve
- on condition that
- open one's heart to
- onwards
- oven-ready
- openness
- obli-gation
- overstretch
- over and done with
- overspill
- opposable digit
- opening move
- overflow with
- overseas
- optical illusion
- overstated
- ocean liner
- outlandishness
- out loud
- on attach special importance to
- occur with
- one's regrets
- olive green
- officialdom
- over-anxious
- overcrowding
- observe furtively
- on a large scale
- ornaments
- offending
- objec t
- ordeals
- opposed to
- over talk round
- of the time
- ornateness
- only remaining
- overtime
- objecti-vity
- once-a-year
- on all sides of
- odd-job man
- opening ceremony
- onward
- out of position
- on the far side of
- outlying districts
- open to
- open to suggestions