Grinder
Part of speech: noun
Definition: A power tool with a spinning abrasive disc, used for grinding, smoothing, and shaping materials, usually metal. A sandwich made on a long, cylindrical roll.
Example sentence: The president is supposed to stand up for the First Amendment and stand up for the free press - not put us through the meat grinder.
Sub
Part of speech: noun
Definition: A submarine.A submarine sandwich—a sandwich made on a long bun.A substitute.A substitute in a football (soccer) game: someone who comes on in place of another player part way through the game.Short for subscription: a payment made for membership of a club, etc.A submissive in BDSM practices.
Part of speech: preposition
Definition: Under.
Part of speech: verb
Definition: 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.