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on the rails
operating or functioning as planned
on the rampage
acting violently or uncontrollably
on the ready
prepared and available to act
on the receiving end
Being the target of something sent.
on the rise
Increasing in number or popularity.
on the run
escaping or moving quickly.
on the same page
sharing the same understanding or agreement
on the same wavelength
Thinking similarly or understanding each other.
on the shelf
unmarried and unlikely to marry
on the side of the angels
supporting good or noble causes
on the skids
in decline or experiencing difficulties
on the sly
Secretly or stealthily.
on the spot
immediately or right away.
on the square
honest and straightforward in dealings.
on the stocks
available for sale or trade.
on the street
located outside on a public road
on the table
under consideration or discussion
on the toss of a coin
deciding something randomly by flipping a coin
on the trot
In quick succession or continuously.
on the up
Improving or becoming more successful.
on the up-and-up
honest and trustworthy in actions.
on the uptake
Quick to understand or learn.
on the verge
very close to something happening.
on the wagon
abstaining from drinking alcohol.