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a submersible warship usually armed with torpedoes

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a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments)

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be a substitute

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before a judge or court of law

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in secret or covertly

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a unit assembled separately but designed to fit with other units in a manufactured product

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an interval that is included in another interval

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designed and carried out secretly or confidentially

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the region of Africa south of the Sahara Desert

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one of a battery of related tests

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slightly sour to the taste

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less than acute