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Adverb: on the fly
  1. While in motion
    "he caught the punt on the fly"
     
  2. On the run or in a hurry
    "she wrote those letters on the fly";
    - hurridly

Encyclopedia: On the fly

Nearest

on tenterhooks
on the average
on the ball
on the blink
on the button
on the coattails
on the contrary
on the dot
on the face of it
on the fence
on the fly
on the fritz
on the go
on the hook
on the house
on the job
on the level
on the line
on the loose
on the mend
on the nail