O字母开头的单词或词组(第5页)：

• off the hook
• off the record
• on the run
• on the shelf
• on the side
• on the spur of the moment
• on the strength of
• on the table
• on the trot
• on thin ice
• on top
• on top of
• once and for all
• on order
• on paper
• on record
• on the quiet
• on that score
• on the grounds of
• on the alert
• on the air
• on the button
• on the go
• on the average
• on the house
• on the horizon
• on the hour
• on the increase
• on the road to
• on the move
• on the job
• on the part of
• one way or another
• only too
• organisation
• organise
• other than
• out of character
• out of action
• out of hand
• out of joint
• out of line
• out of pocket
• out of print