- one stop
- one-stop
- one swallow doesn't make a summer
- one thing after another
- one thing leads to another
- one time
- one-time
- one to one
- one-to-one
- one touch
- one-touch
- one-track mind
- one-trick pony
- one up
- one upmanship
- one-upmanship
- one-upmanships
- one up on
- one up (on sb)
- one upsmanship
- one-upsmanship
- one-upsmanships
- on-even-keel
- on every hand
- on everyone's lips