Definition of "on foot"

on foot

prepositional phrase
1. On one's feet; walking, jogging or running but not in a vehicle or on the back of an animal.
  Quotations
  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.
  1949 November and December, “Notes and News: Festiniog and Welsh Highland Railways”, in Railway Magazine, page 408
2. (now rare, chiefly hunting) On the move; astir.
3. In progress or in preparation; active, in operation.
  Quotations
  [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 […] .
  1789, John Moore, Zeluco, Valancourt, published 2008, page 113