KC is right...
The name Grinder was named after the men who worked the ship building
yards of New Bedford, Massachusetts during WWII.
Local Italian vendors would set up shop near these ship yards and
build overstuffed sandwiches to sell to the men who ground the hot
iron pegs used in the construction of our war ships. They were known
as “The Grinders”. These oversized sandwiches made on fresh homemade
Italian Loaves came to be known as a “Grinder”.
I searched extensively and this is the only mention of the origin of
"grinder". It seems a very feasible explanation.
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