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- on the diagonal
- on the dotted line
- on the double
- on the far side of
- on the fence
- on the fly
- on the go
- on the ground
- on the half shell
- on the heels of
- on the hoof
- on the house
- on the increase
- on the job
- on-the-job
- on the level
- on the line
- on the make
- on the map
- on the march
- on the market
- on the mend
- on the money
- on the move
- on the nose
- on the order of
- on the outs
- on the part of one
- on the prowl
- on the quiet
- on the rack
- on the record
- on the rocks
- on the ropes
- on the run
- on-the-scene
- on the shelf
- on the sick list
- on the side
- on the sly
- on the spot
- on the spur of the moment
- on the square
- on the stage
- on the street
- on the string
- on the sunny side of
- on the surface
- on the table
- on the take
- on the tapis
- on the tiles
- on the tip of one's tongue
- on the town
- on the turn
- on the wagon
- on the water wagon
- on the way
- on the whole
- on the wind
- on the wing
- on thin ice
- onthophagus
- ontic
- ontically
- on time
- on tiptoe
- onto-
- onto
- ontogenesis
- ontogenetic
- ontogenetically
- ontogenist
- ontogeny
- ontological
- ontological argument
- ontologically
- ontologism
- ontologist
- ontologize
- ontology
- on top of
- on top of the world
- on track
- onus
- on view
- onwaiting
- onward
- onwardness
- onwards
- ony
- onycha
- onychogale
- onychogalea
- onychoid
- onychomys
- onychophoran
- on-year
- onygena
- -onym