- of distinctive character, change to: distinctive (wordiness)
- off the wall: cliché (avoid)
- old adage: delete old (redundancy)
- older and wiser: cliché (avoid)
- Olympic proportions: cliché (avoid)
- on a roll: cliché (avoid)
- once in a lifetime: cliché (avoid)
- one fell swoop: cliché (avoid)
- on more than one occasion: cliché (avoid)
- on the occasion of; change to: when (wordiness) [When citizens vote, we express democracy. Not: On the occasion of voting, we express democracy.]
- one and the same: cliché (avoid)
- one and the same: delete one and (redundancy) [The same is true for you and me. Not: One and the same is true for you and me.]
- one fell swoop: cliché (avoid)
- open secret: cliché (avoid)
- original source: delete original (redundancy), except when material is from a secondary source. [The source of the quote is well known. Not: The original source of the quote is well known. But: Secondary sources should not be ignored]
- other things being equal: cliché (avoid)
- our fair city: cliché (avoid)
- outside the box: cliché (avoid)
- outcome: delete final (redundancy) [The outcome was clear. Not: The final outcome was clear.]
- out of the woods: cliché (avoid)
- outpouring of support: cliché (avoid)
- out to lunch: cliché (avoid)
- over and done with: delete and done with (redundancy) [The discussion was done. Not: The discussion was over and done with.]
- over the hill: cliché (avoid)
- over with: delete with (redundancy) [The subject was done. Not: The subject was done with.]
- overwhelming odds: cliché (avoid)
- own worst enemy: cliché (avoid)
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