sub
/sʌb/noun
Definitions
A submarine.
A submarine sandwich: a sandwich made on a long bun.
Example: We can get subs at that deli.
A substitute, often in sports.
Example: She worked as a sub until she got her teaching certificate.
(often in plural) A subscription: a payment made for membership of a club, etc.
verb
Definitions
To substitute for.
To work as a substitute teacher, especially in primary and secondary education.
To replace (a player) with a substitute.
Example: He never really made a contribution to the match, so it was no surprise when he was subbed at half time.
Less commonly, and often as sub on, to bring on (a player) as a substitute.
Example: He was subbed on half way through the second half, and scored within minutes.