phrasal in motion ; busy , while still in the air ; without the ball bouncing , in a hurry and often without preparation ; hastily , spontaneously , simultaneously with another task
ON THE FLY
Meaning of ON THE FLY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012