on the fly

Adverb

not-comparable of the ball idiomatic

Japanese Meaning

（野球用語）ボールが空中にある状態、すなわち地面に触れる前の状態を示す。 / （熟語）即席に、または臨機応変に行うさまを意味する。

The center fielder caught the ball on the fly, preventing the runners from advancing.

センターフィールダーは打球が地面に触れることなく捕球し、走者の進塁を防いだ。

Sense（1）

(baseball, of the ball) While in the air, without having touched the ground.

Jones caught the ball on the fly.

Sense（2）

(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.