Here are some examples of how "through" is used as a prefix:
* Throughfare: A passageway or road through a place.
* Throughout: Extending or happening from one end to the other.
* Throughline: A main thread or idea running through a story or piece of work.
* Throughput: The amount of something that is processed or produced in a given period.
* Throughbred: A horse bred from purebred parents.
In these examples, "through" implies movement, completion, or continuity.
However, it's important to note that "through" can also be used as a preposition, meaning "from one side of something to the other," as in "I walked through the door." In this case, it's not technically a prefix.