- In progress.
- Being planned or prepared.
- On foot.
Middle english, from a- + foot foot.
- There is a big project afoot to build a new bridge.
- There is something afoot and I don't know what it is.
- There's a big plan afoot to revitalize the downtown area.
- We heard that something was afoot and we wanted to know more.
- He went afoot to explore the nature trail.