occupy one‘s timewait a long time
oddsurprise
Of course not (mind).welcome
Oh, no.sorry
on edgenervous
on endcontinuously // for some time // for quite a while
on my ownherself
on one‘s own(by) oneself
on the courtyardoutside
on the newson television
on the second floor // take the stairs upon the floor above
on timeavoid being late
on your deskin an office
once // no longernot anymore
once and again // from time to time // on and off // off and onsometimes // occasionally
One day‘s as good as the next.He‘s available any day.
one in a millionrare
one moreanother
one step at a timegradually
One‘s job search was unsuccessful.sb. was unable to find a job.
one‘s schoolwork be sufferingbe interfering with one‘s studies
onlypart
only a couple of timestwice // two times
only a ten-minute walknot need to take a car
only occasionallyonce in a while
only sb. can‘talmost everyone can
only three of ...most of ... not
only try to helpOne‘s intention be good.
optionalsb. can do sth. ... if sb. wants to
organizetake care of
other thanexcept
ought to be easier // unlessmight be difficult
out of breath // run // rushhurry
out of dateup to date
out of it // in another worldthink only about
out of ordernot work // break down
out of print for sometime nowno longer available
out of the wayfinish
out of this worlddelicious // like sth. very much
outcomeresult
outgoingfriendly
out-of-dateup-to-date
outstandinggood
overend
over one‘s headbeyond sb. // not understand
overcome her fear of public speakingnot afraid to give a speech
oversleepabsent
oversleep // on time // in a hurry // inside outbe rushed
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