sub Definition in Cambridge American English Dictionary
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Definition of "sub" - American English Dictionary

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subnoun [C]

 us   /sʌb/

sub noun [C] (REPLACEMENT)

short form of substitute teacher

sub noun [C] (SHIP)

short form of submarine : a nuclear sub

sub noun [C] (FOOD)

short form of submarine (sandwich)

subverb [I]

 us   /sʌb/ (-bb-)
to work as a substitute teacher: She subs at three schools.
(Definition of sub from the Cambridge Academic Content Dictionary © Cambridge University Press)
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“sub” in American English

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