sub

Abbreviation of submarine.

Clipping of submarine sandwich: a sandwich made on a long bun.

潜艇

Clipping of submersible.

Clipping of substitute, often in sports or teaching.

Clipping of subscription (“a payment made for membership of a club, etc.”).

Clipping of subtitle

Clipping of subroutine (sometimes one that does not return a value, as distinguished from a function, which does)

Clipping of subeditor

Clipping of subcontractor

Clipping of subwoofer

Clipping of submission (of a work for publication).

Clipping of submissive

Clipping of subordinate

Clipping of subaltern

Clipping of subscription (or (by extension) a subscriber) to an online channel or feed.

Clipping of subsistence money, part of a worker's wages paid before the work is finished.

Clipping of subject (“particular area of study”)

Clipping of subliminal (“an audio or video recording intended to produce physical or psychological changes in the listener”)

Clipping of subreddit.

To substitute for.

To work as a substitute teacher, especially in primary and secondary education.

To replace (a player) with a substitute.

To bring on (a player) as a substitute.

To perform the work of a subeditor or copy editor; to subedit.

To subtitle (usually a film or television program).

To lend (a person) money.

To subscribe.

To take a submissive role.

To prepare (a slide) with a layer of transparent substance to support and/or fix the sample.

To coat with a layer of adhering material; to planarize by means of such a coating.

Under.