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sub

 
pronunciation:
suhb
parts of speech:
noun, intransitive verb
features:
Word Combinations (noun, verb), Word Explorer
part of speech: noun
definition 1: (informal) shortend form of "submarine," a sea vessel that can travel under water.
The sub aimed its torpedoes at the enemy ship.
definition 2: shortened form of "substitute teacher."
Our English teacher was sick today, so we had a sub.
similar words:
substitute
definition 3: shortened form of "submarine sandwich," a large sandwich consisting of a long roll filled with a variable assortment of meats, cheeses, vegetables, and condiments; hero sandwich.
definition 4: shortened form of "subscription."
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part of speech: intransitive verb
inflections: subs, subbing, subbed
definition: (informal) to take the place of another; serve as a substitute for another.
I can sub for your class on Friday, but not on Thursday.
similar words:
double, fill in, substitute
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  education