Prerequisites
An etymological fallacy becomes possible when a word has changed its meaning over time. Such changes can include a shift in scope (narrowing or widening of meanings) or of connotation (amelioration or pejoration). In some cases, meanings can also shift completely, so that the etymological meaning has no evident connection to the current meaning.
For example:
- The word hound originally simply meant "dog" in general. This usage is now archaic or poetic only, and hound now almost exclusively refers to dogs bred for the chase in particular.
- The meaning of a word may change to connote higher status, as when knight, originally "servant" like German Knecht, came to mean "military knight" and subsequently "someone of high rank".
- Conversely, the word knave originally meant "boy" and only gradually acquired its meaning of "person of low, despicable character".
- The word lady derives from Old English hlæf-dige ("loaf-digger; kneader of bread"), and lord from hlafweard ("loaf-ward; ensurer, provider of bread"). No connection with bread is retained in the current meaning of either word.
Read more about this topic: Etymological Fallacy