on foot

prep_phrase

Etymology: From Middle English on fote, from Old English on fōte (“on foot”), equivalent to on + foot.

1. On one's feet; walking, jogging or running but not in a vehicle or on the back of an animal.

   “The pub's not far: let's go on foot.”

   “At the same time, the encroachment of vegetation proceeds apace, and broom and brambles have already made portions of the line impassable, even on foot.”

2. On the move; astir.
3. In progress or in preparation; active, in operation.

   “[W]ithin a short time it was generally believed at Naples, that a treaty of marriage was on foot between Zeluco and the young lady in question […].”

   “‘I didn't know anything of this sort was on foot.’ Brangwen smiled awkwardly.”