Letter O, Page 79 of 232 Pages (ON)

On a mission for
on a monitor Dot follower
on a moving ship
On a navy mission
On a need-to-know ___
On a need-to-know basis
On a new trunk
On a normal basis
On a Pacific poop deck
On a Paleo diet, say?
on a par
On a par with
On a par with, in terms of tidiness
On a par, in Orléans
On a par, in Paris
On a PC, it does nothing by itself
On a pedestal
on a pedestal Piece
on a pedestal Put
On a peg, as a golf ball
On a pens.
On a pension, briefly
On a pension: Abbr.
on a phone 0
on a phone 7
on a phone 8 In base
on a phone Six It has sides
On a pinnacle
On a plane, for short
On a plane, train, or bus
On a plane?
On a previous occasion
On a proportional basis
on a puff of air Move
On a rampage
On a rapid rise
On a recurring basis
On a regular basis
On a road trip
On a road trip, say
On a roll
On a roof deck, say
On a scale from one ___
On a scale of ___ 10
On a scale of ___ ten
On a scale of 1 to 10, what one amp in "This Is Spinal Tap" goes to
On a scale of one ___
On a scale of one to ___
On a schooner, say
on a score Arc Hit in a high
on a scorecard Bunt situation
On a Seder plate, it represents the arrival of springtime
On a ship
On a ship or train
On a ship, perhaps
On a ship, train or plane
on a ship, train, plane or other vehicle
On a similar note and the like
On a similar note, e.g.
On a single occasion
On a slant
On a slant: Abbr.
ON a slope
On a slow boat to
On a slow boat to China
On a smaller scale
On a sofa
On a sofa, say
On a spit, say
On a spree
On a steamer, say
On a streak
On a streak?
On a sugar high, say
on a surface Condense
on a surface Gather
On a tether
On a tight leash
On a tight schedule
On a tilt
On a tilt.
On a tool's upper surface?
on a trai ship train plane and other vehicles
On a train
On a trip
On a vast scale
On a voyage
On a voyage on the ocean
On a walk, perhaps
on a wall Layer
on a watch
On a wayward path
On a wet voyage
On a whale watch, perhaps
On a whale-watching tour, say
On a winning streak
On a wish list
on a with
On a yacht, maybe
On a yacht, perhaps
On a yawl, say
on account
On account (of)
On account of
On account of (with 'to')
on account of rain Called First to be
on active service
ON address, or Disney duck
On again
On again, as a candle
On again, as a lantern
On again, in a way
On again, off again love stories, say
on air Walking
On alert
On all (crawling)
On all ___ (crawling, say)
On all counts
on all fours Move
ON all sides
On an ___ basis
On an ___ keel
On an ad ___ basis
On an airplane
On an airplane, it's filled with nitrogen rather than air
On an America's Cup yacht
on an angle
On an ark, e.g.
On an errand, say
On an even __ (steady)
On an even ___
On an even ___ (balanced)
On an even ___ (stable)
On an even keel
On an incline
On an ocean journey
On an ocean liner
On an ocean liner, e.g.
On an ocean liner, maybe
On an ocean liner, perhaps
On an ocean liner, say
On an ocean trip
On an ocean voyage
On an opponent's field
On an upper floor
On an upper storey
On an upswing
On and after
on and off
On and on
On and on ... or how to read 18-, 27-, 37- and 51-Across to understand this puzzle's theme?
On and on and on
On and on and on and on and ...
On and on and on and on and 
on and on Going Coming or
On another call
On antonym
on any occasion
on approval
on april 19 1775 hundreds of british
on assignment
on bad terms
On balance
On base
On base, in baseball
On base, say
On bed rest, say
ON behalf of
on behalf of king
ON BENDED
On bended ___
On better behavior, to Santa
On Beyond Zebra! boy Conrad Cornelius o'Donald ___
ON board
On board a ship or boat
on board Drink
on board Put
on board Room
on board Safe deposit box item
ON board ship
on board Stored
on bodybuilders Ripple
On both banks of
On both feet
On both sides
On both sides of
on branch
On break, say
on Bring about
on Build
on Call
On call device
on cargo Put
on Carry
On chairs
On Chesil Beach novelist Ian
on Chinese menus General address
On clippers?
On close personal terms
On cloud __
On cloud ___ (elated)
On cloud nine
On cloud nine feeling
On cloud Nine Group of
on Coat
On condition
On Contradiction author
On court stabbing victim
On deck
on deck Longer
On deck, for example
On deck, on ships
On deck, perhaps
On deck, say
On deep water
On delay
On delivery?
on demand
On different sides
On disk
On Disk Clear, as a
On disk, say
On display
On dope
on draft
on draft Drink
On drugs
On drugs, say
On drugs, slangily
On dry ground
On dry Land
On dry land
on duty
on each occasion
on earth
On Earth ___ is in Heaven
on earth Anywhere Not going
on earth Heaven
On easy street
On easy street, e.g.
On eBay, e.g.
On edge
On edge with excitement
On edge, as nerves
On edge, with "up"
On edibles, say
On either side of the center
On empty
on end
on end on