What is the meaning of the word "sub"?

Definitions:

  1. a large sandwich made of a long crusty roll split lengthwise and filled often filled with a combination of meats, cheese, tomato, onion, lettuce, and condiments copy to clipboard noun
    • The local grocery store had the best subs where I grew up. copy to clipboard
  2. be a substitute copy to clipboard verb
    • The young teacher had to substitute for the sick colleague copy to clipboard

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