Understanding “Quid Pro Quo”
Like other spontaneously evolving systems, language tends to move in the direction of more effective cooperation. But sometimes usage distorts once-clear words into sources of confusion.
C.S. Lewis cited “gentleman” as an example. Its usage moved from stating a fact — a man who was landed and had a coat of arms — to a way of praising someone’s behavior, something we already had plenty of words for. But in the process, the word lost its ability to clearly communicate what it once meant.