Here are some examples of how the root word "sub" is used in English:
* Submarine: A vehicle that travels under water.
* Subterranean: Something located below the surface of the earth.
* Subordinate: Someone who is under the authority of another.
* Submerge: To go under water.
* Subsequent: Happening after something else.
The root word "sub" can also be combined with other prefixes and suffixes to create new words. For example:
* Substandard: Below the standard.
* Substitution: Replacing something with something else.
* Subtle: Not obvious or easy to notice.
* Subcommittee: A smaller committee under a larger one.
Understanding the meaning of the root word "sub" can help you understand the meaning of many English words.