The difference between Hoagie and Submarine sandwich
When used as nouns, hoagie means a sandwich made on a (usually soft) long italian roll, whereas submarine sandwich means a sandwich made on a long roll split lengthwise.
check bellow for the other definitions of Hoagie and Submarine sandwich
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Hoagie as a noun (US, central and eastern, _, Pennsylvania):
A sandwich made on a (usually soft) long Italian roll; a submarine sandwich.
Examples:
"I am going to Wawa to get a hoagie for lunch."
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Submarine sandwich as a noun:
A sandwich made on a long roll split lengthwise.