They walked home slowly.

Meaning: A group of people walked home at a leisurely pace or took their time walking home.

Choice of Words: They refers to a group of people or things, in this case, a group of people. Walked means to move on foot, and Slowly means to move at a leisurely pace or to take one's time. Putting these words together, the sentence means that the group of people moved on foot at a leisurely pace or took their time walking home.