Entry 2 senses Webster, 1913

Afoot

/əf-o͝ot'/ · A·foot · IPA /əˈfʊt/

01 adv. On foot.

1.
On foot.
“We 'll walk afoot a while.” — Shak.
2.
Fig.: In motion; in action; astir; in progress.
“The matter being afoot.” — Shak.