A byword is a saying, satire, reproach, topic of public talk, or object of remark. It may describe a person or nation reduced to astonishment, derision, ruin, or proverbial notoriety.
The Bible uses the term for the result of judgment or calamity and for those who become objects of satire or public discussion. The underlying words include ideas of consternation, astonishment, waste, satire, and a topic of conversation.
Several Hebrew terms lie behind the English word: one denotes consternation or an object of remark, another satire or proverb, and another a topic or object of talk.