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on assumption
on assumption that
on average
on back of
on ball
on beam
on beat
on bed of roses
on bed roses
on behalf of
on bench
on bias
on blink
on board
on borderline
on bottom
on brain
on breadline
on brink
on brink of
on bum
on button
on call
on canvas
on case
on certain conditions
on certain occasions
on cloud nine
on collision course
on comeback trail
on condition
on contrary
on counts
on credit
on critical list
on cuff
on cutting edge
on day
on deathbed
on debit side
on deck
on defensive
on dime
on display
on docket
on dole
on dot
on double
on downer
on dry land
on duty
on east side of
on edge
on edge of
on ego trip
on empty stomach
on end
on even keel
on face
on face it
on face of it
on faith
on far side
on fence
on file
on fire
on foot
on fours
on friendly terms
on fritz
on front burner
on furlough
on game
on go
on good terms
on grounds
on grounds that
on guard
on hand
on hands and knees
on hands knees
on head
on high
on high horse
on hit list
on hold
on holiday
on hook
on horizon
on hot seat
on house
on hunch
on ice
on impulse
on initiative
on inside
on internet
on its way
on job
on kip
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