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on qt
on qui vive
on quiet
on rampage
on rare occasions
on record
on right track
on rims
on road
on road recovery
on road to
on road to recovery
on rock
on roll
on ropes
on sabbatical
on safe side
on sale
on same wavelength
on scent
on schedule
on second thought
on shelf
on shore
on short notice
on sick list
on side
on side of
on sidelines
on skid
on slant
on slippery ground
on sly
on small scale
on someone
on sour note
on speaking terms
on spot
on spur moment
on spur of moment
on spur of the moment
on spur the moment
on stick
on streak
on stream
on string
on subject
on subject of
on surface
on tab
on take
on tap
on target
on tenterhooks
on that
on that account
on that occasion
on the alert
on the and up
on the arm
on the assumption
on the assumption that
on the back of
on the ball
on the beam
on the beat
on the bench
on the bias
on the blink
on the borderline
on the bottom
on the brain
on the breadline
on the brink
on the brink of
on the bum
on the button
on the canvas
on the case
on the comeback trail
on the contrary
on the critical list
on the cuff
on the cutting edge
on the debit side
on the defensive
on the docket
on the dole
on the dot
on the double
on the east side of
on the edge
on the edge of
on the face
on the face it
on the face of it
on the far side
on the fence
on the fritz
on the go
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