- on top form
- ornaments
- on standby
- obli-gation
- open one's heart to
- of the time
- occur to
- objecti-vity
- offending
- ornateness
- odd-job man
- office-holder
- oesophagus
- on one's head
- out of trouble
- openwork
- oviposit
- observation post
- of mixed breed
- opening move
- outlandishness
- on attach special importance to
- of the same family
- one step at a time
- ordeals
- over talk round
- obsessed with one's health
- of one's own volition
- official approval
- official list
- on every side
- on the lose
- on track
- open to the public
- opposite each other
- optical illusion
- orchestration
- overspill
- overflow with
- overstretch
- of long ago
- on the far side of
- occupied in
- observance of
- on the HP
- once a day
- on horseback
- official killer
- outgoing person
- ostenta-tious
- ossified
- old fogy
- orga-nize
- of no consequence
- one at a time
- order someone about
- observe the rules
- overview
- over-suspicious
- on reflection
- order back
- opulently
- obit
- objects
- on the distaff side
- open to suggestions
- other ranks
- out of position
- out-of-doors
- outlying districts
- occur with
- opposed to
- out loud
- origination
- order about
- open up
- offertory
- obsessional
- obtain by force
- overlap
- on one' head
- on condition that
- offer up
- of the Dark Ages
- of benefit to
- overwhelming majority
- overdo it
- ocean liner
- over-anxious
- on one occasion
- opening ceremony
- overstate the case
- officially approve
- observe furtively
- opposable digit
- on a large scale
- on all sides of
- on the basis of
- only remaining
- onward