Sub

Noun

 * 1) A submarine.
 * 2) A submarine sandwich&mdash;a sandwich made on a long bun.
 * 3) 🇺🇸 A substitute.
 * 4)  A substitute in a football (soccer) game: someone who comes on in place of another player part way through the game.
 * 5)  Short for subscription: a payment made for membership of a club, etc.
 * 6)  A submissive in BDSM practices.
 * 7)  Short for subtitle.
 * 8)  A subroutine (sometimes one that does not return a value, as distinguished from a function, which does).

Synonyms

 * grinder, hoagie

Hypernyms

 * sandwich

Verb

 * 1) 🇺🇸 To substitute for.
 * 2) 🇺🇸 To work as a substitute teacher, especially in primary and secondary education.
 * 3)   To replace (a player) with a substitute.
 * 4)   Less commonly, and often as sub on, to bring on (a player) as a substitute.
 * 5)  To perform the work of a subeditor or copy editor; to subedit.

Preposition

 * 1) Under.

Thesaurus
agent, alternate, alternative, analogy, backup, change, change places with, changeling, collateral, common, comparison, copy, counterfeit, crowd out, cut out, demeaning, dependent, deputy, disadvantaged, displace, double, double for, dummy, equal, equivalent, ersatz, exchange, fake, fill in for, fill-in, ghost, ghostwrite, ghostwriter, humble, imitation, in the shade, inferior, infra dig, junior, less, lesser, locum tenens, low, lower, lowly, makeshift, metaphor, metonymy, minor, modest, next best thing, ordinary, personnel, phony, pigboat, pinch hitter, pinch-hit, proxy, relief, relieve, replace, replacement, represent, representative, reserves, ringer, second rank, second string, secondary, servile, sign, spares, spell, spell off, stand in for, stand-in, subaltern, subject, submarine, submersible, subordinate, subrogate, subservient, substituent, substitute, substitute for, substitution, succedaneum, succeed, supersede, superseder, supplant, supplanter, surrogate, swap places with, symbol, synecdoche, third rank, third string, token, tributary, under, underprivileged, understudy, understudy for, utility player, vicar, vice-president, vice-regent, vulgar