sub
[C/U] Both
pl: subspast: subbedpp: subbeding: subbing
Countable when referring to a specific person or object like a substitute teacher or a submarine. Uncountable when used in technical jargon to describe a general category of substitution.
Countable when referring to a specific person or object like a substitute teacher or a submarine. Uncountable when used in technical jargon to describe a general category of substitution.