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Adverb: on the spur of the moment
  1. Quickly and without warning
    "he decided to go to Chicago on the spur of the moment";
    - suddenly, all of a sudden, of a sudden, abruptly, dead, short

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on the Q.T.
on the QT
on the qui vive
on the road
on the rocks
on the ropes
on the run
on the side
on the sly
on the spot
on the spur of the moment
on the table
on the trot
on the up-and-up
on the way
on the whole
on the wing
on thin ice
on time
on top of the world
on tour