on the fly
Definition from Wiktionary, the free dictionary
- (baseball, of the ball) Without a bounce.
- Jones caught the ball on the fly
- (idiomatic) Spontaneously or extemporaneously; done as one goes, or during another activity.
- The software program has a table of values for some results, but calculates others on the fly.
- (spontaneously): on the spot
(baseball, of the ball) Without a bounce