bootheel

[boot-heel]

noun (sometimes initial capital letter)

an area of SE Missouri where the Missouri-Arkansas border dips southward forming a rectangular-shaped extension of the state.

Origin of bootheel

boot¹ + heel¹; so called from the shape on the map; cf. panhandle¹, panhandle²

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

There was a ring of a bootheel as the two men approached the cabin unsuspectingly.
The Adventure Girls at K Bar O
Clair Blank