- be of rare occurrence
- be of service to
- be of some help to sb
- be of some help to sb.
- be of the same mind
- be off of one's head
- be off one's game
- be off one's head
- be off the habit
- be off the press
- be offended at
- be offended with sb for sth
- be offered a place as...
- be offhand with sb
- be officially termed
- be old enough to know better
- be old for one's years
- be on a diet
- be on a false scent
- be on a good wicket
- be on a lark
- be on a losing streak
- be on a parity with
- be on a razor's edge
- be on a sticky wicket
- be on a winning streak
- be on an equality with
- be on an equality with...
- be on bad terms with sb
- be on familiar terms with...
- be on first-name terms with sb
- be on good terms with sb
- be on heat
- be on intimate terms with
- be on it
- be on leave
- be on location
- be on one's back
- be on one's best behaviour
- be on one's ear
- be on one's game
- be on one's good behavior
- be on one's high horse
- be on one's honour to do sth
- be on one's honour to do sth.
- be on one's mettle
- be on one's uppers
- be on parole
- be on sb's back
- be on sb's track
- be on sb.'s back
- be on sentry
- be on short commons
- be on speaking terms
- be on tenterhooks
- be on the advance
- be on the ball
- be on the bench
- be on the cushion
- be on the door
- be on the downgrade
- be on the drink
- be on the hedge
- be on the loose
- be on the market
- be on the mike
- be on the muscle
- be on the rack
- be on the ragged edge
- be on the rates
- be on the razzle
- be on the receiving end
- be on the right tack
- be on the rope
- be on the scent
- be on the sick list
- be on the spree
- be on the stick
- be on the straight
- be on the strength
- be on the tiles
- be on the tiptoe of expectation
- be on the track of sb
- be on the track of sb.
- be on the upswing
- be on the warpath
- be on the watch
- be on the wrong tack
- be on thorns
- be on ticket-of-leave
- be on to
- be on vacation
- be on visiting terms with
- be on wires
- be one's own enemy
- be one's own man
- be one's own master
- be one-up on sb
- be oneself
- be only skin and bone
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