Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Cheesesteak" Definition
noun
A philadelphia snack food consisting of chopped steak and melted cheese in a bread roll.
Source: Wiktionary
A sandwich consisting of thinly sliced beef topped with melted and condiments (as fried onions or peppers).
Source: Merriam-Webster
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