- on and off
- on and on
- on-and-on
- on a need-to-know basis
- on an even keel
- on-an-even-keel
- onanism
- onanisms
- onanist
- onanistic
- onanists
- on a par with
- on a par with sb
- on a par with sb/sth
- on a par with sth
- on a razor edge
- on a roll
- on a shoestring
- on a short fuse
- on a silver platter
- on-a-string
- on at to do
- on automatic pilot
- on a wing and a prayer
- on back