noun

1. A submarine.

2. A submarine sandwich: a sandwich made on a long bun.

   “We can get subs at that deli.”

3. A substitute, often in sports.

   “She worked as a sub until she got her teaching certificate.”

Synonyms: grinder, hero, hero sandwich, hoagie, po' boy, spuckie, submarine, submarine 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.

   “He never really made a contribution to the match, so it was no surprise when he was subbed at half time.”