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  • on the eve of
  • on the face it
  • on the face of it
  • on the fast track
  • on the fence
  • on the fence, be
  • on the fire
  • on the fly
  • on the fritz
  • on the front burner
  • on the gallop
  • on the go
  • on the gravy boat
  • on the gravy train
  • on the gripping hand
  • on the ground
  • on the ground floor
  • on the half shell
  • on the head
  • on the heels of
  • on the hill
  • on the hog
  • on the hoof
  • on the hook
  • on the horizon
  • on the horns a dilemma
  • on the horns dilemma
  • on the horns of a dilemma
  • on the horns of dilemma
  • on the hot seat
  • on the hour
  • on the house
  • on the hustle
  • on the in, be
  • on the increase
  • on the inside
  • on the jar
  • on the job
  • on the jump
  • on the knocker
  • on the lam
  • on the legit
  • on the level
  • on the line
  • on the lines of
  • on the lookout
  • on the loose
  • on the make
  • on the map
  • on the march
  • on the mark
  • on the market
  • on the mat
  • on the mend
  • on the money
  • on the move
  • on the nail
  • on the needle
  • on the nod
  • on the nose
  • on the off chance
  • on the offensive
  • on the one hand
  • on the order of
  • on the other foot
  • on the other hand
  • on the outs
  • on the pad
  • on the parish
  • on the part of
  • on the pig back
  • on the pig's back
  • on the pigs back
  • on the pipe
  • on the point of
  • on the prowl
  • on the q.t
  • on the q.t.
  • on the qt
  • on the qui vive
  • on the rack
  • on the rag
  • on the ragged edge
  • on the razor edge
  • on the razor's edge
  • on the razors edge
  • on the re bound
  • on the re-bound
  • on the rebound
  • on the receiving end
  • on the record
  • on the right foot, get off
  • on the right side of the tracks
  • on the right side of tracks
  • on the right side the tracks
  • on the right side tracks
  • on the right tack
  • on the rims
  • on the road
  • on the rocks
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