You know that red octagonal traffic sign that says STOP? It's telling you to stop moving and to stay put.
You're familiar with stop as a word meaning "quit moving," but the word's original meaning is "to plug up a hole," like when you stop the hole in your bucket with oakum (or napkins). In English, stop came to mean "arrest" for any kind of movement. Stop crime! Stop that check! Stop that thief! Stop writing commands with stop! A stop can also be a place to rest, and the period at the end of this sentence is a "full stop."