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.
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.
Categories: adjective adverb informal