What is what does sub mean?

The term "sub" has multiple meanings depending on the context in which it is used. Here are some of the commonly used meanings of "sub":

1. Submarine: Sub is a short term used for submarines, which are vehicles designed to travel underwater.

2. Substitute: Sub is often used as a shortened version of "substitute." In this context, it refers to a person who takes the place of another person or a thing that serves as a replacement for something else.

3. Subordinate: Sub can also mean "subordinate" as in a person or entity that is lower in rank or position.

4. Subject: When referring to a topic or discussion, the term "sub" can be used to mean "subject."

5. Subterranean: Sub can also mean "subterranean," referring to something that is located underground.

6. Subscription: In the context of online services or products, the term "sub" can be used as shorthand for "subscription."

7. Submission: In sports such as wrestling and martial arts, the term "sub" can be used as an abbreviation for "submission," which is a term that refers to an opponent tapping out or giving up.

Overall, the meaning of "sub" varies based on the context in which it is used, as it can be used as a prefix or abbreviation for several different words.