on the wing

on the wing  {adv.} or  {adj. phr.}

1. In the air; while flying.

The duck flew away, but John shot it on the wing.

2.  {informal}

In constant motion; always very busy.

Susan was on the wing doing things to get ready for her trip.

Mr. Jones had a busy schedule and his secretary had to catch him on the wing to sign the letters.

Syn.: ON THE FLY.

3.  {informal}

Moving from one place to another; traveling; going somewhere.

Mary's husband is a traveling salesman and he's always on the wing.

They stayed in France for a week and then they were on the wing again.

Syn.: ON THE GO, ON THE MOVE.