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English definition of “sub”

sub

noun [C]  /sʌb/ us  

sub noun [C] (REPLACEMENT)

short form ofsubstitute teacher

sub noun [C] (SHIP)

short form ofsubmarine: a nuclear sub

sub noun [C] (FOOD)

short form ofsubmarine (sandwich)

sub

verb [I]  /sʌb/ (-bb-) us  
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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