of the greatest possible importancethe report was missing a pivotal piece of information

in 1838

• on the double
• on the far side of
• on the fence
• on the fritz
• on the go
• on the house
• on the level
• on the money
• on the move
• on the nose
• on the order of
• on the other hand
• on the qui vive
• on the rack
• on the shelf
• on the spot
• on the spur of the moment
• on the surface
• on the warpath
• on the whole
• on tiptoe
• on top of
• onus
• onuses
• onward