The word 'swine' has a direct and ancient lineage from Proto-Germanic 'swīną', which referred to the animal. This term is further traceable to the Proto-Indo-European root 'suH-', meaning 'pig' or 'hog'. The word's journey into English is remarkably straightforward, passing from its Indo-European ancestor through the common Germanic language family into Old English with minimal phonetic alteration. This stable history means the modern English term retains the core meaning of its prehistoric root, designating the animal itself, while also developing a figurative sense for a coarse or despicable person, drawing on traditional associations with the pig.

This is a simplex word of Germanic origin. It functions as a singular noun (with an identical plural form) derived from the Old English 'swīn'.