O字母开头的单词或词组(第6页)：
- or else
- or something
- over and above
- over the hill
- owing to
- own up
- out of season
- out of sorts
- out of step
- out of stock
- out of the blue
- out of the ordinary
- out of tune with
- out of the way
- out of touch with
- out of use
- obscene
- of the essence
- on impulse
- on the verge of
- on oath
- on the blink
- on the brink of
- on the threshold of
- oxide
- officiate
- orator
- omission
- out of luck
- ordinarily
- ornamental
- outwards
- overload
- orientation
- orphan
- outermost
- outfit
- overestimate
- overpass
- overview
- overwhelming
- obedience
- odor
- onward