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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
under construction or not yet ready
on the street
located outside on a public road
on the table
under consideration or discussion
on the tip of one's tongue
Almost remembered, but not quite able to say it.
on the toss of a coin
deciding something randomly by flipping a token
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
in understanding or learning new information
on the verge
very close to something happening.
on the wagon
choosing not to drink any alcohol.
on the wane
Diminishing or decreasing in strength.
on the warpath
angry and ready to fight.
on the way
In the process of arriving.
on the whole
mostly or in general
on the wrong side of history
judged negatively by people in the future
on thin ice
In a risky or uncertain situation.