Sub meaning : A submarine. A submarine sandwich: a sandwich made on a long bun. A substitute, often in sports. (often in plural) A subscription: a payment made for membership of a club, etc. A subtitle. A subroutine (sometimes one that does not return a value, as distinguished from a function, which does). A subeditor. A subcontractor. (BDSM) A submissive. A subordinate. A subaltern. A subscription (or (by extension) a subscriber) to an online channel or feed. Subsistence money: part of a worker's wages paid before the work is finished. To substitute for. To work as a substitute teacher, especially in primary and secondary education. To replace (a player) with a substitute. Less commonly, and often as sub on, to bring on (a player) as a substitute. To perform the work of a subeditor or copy editor; to subedit. To lend. To subscribe. (BDSM) To take a submissive role.