a strong clumsy shoe in which one walks heavily ...1697 obs.
from plod (vb.) + shoe
FIRST DOCUMENTED USE
1697 - see Example below
"...Because I han't a pair of plod shoes, and a dirty shirt,
you think a woman won't venture upon me for a husband."
From: Aesop. A Comedy. With the Addition of a Second Part
By: John Vanbrugh, 1697
• A New English Dictionary on Historical Principles,
James Murray, 1887-1933
• A Supplementary English Glossary,
T. Lewis, O. Davies, 1881