Words change meaning over time in ways that might surprise you. Here are just a few examples of words (so, preacher, take your choice) you may not have realized didn't always mean what they mean today.

1. Nice: This word used to mean "silly, foolish, simple." Far from the compliment it is today!
2. Silly: Meanwhile, silly went in the opposite direction: in its earliest uses, it referred to things worthy or blessed; from there it came to refer to the weak and vulnerable, and more recently to those who are foolish.
3. Awful: Awful things used to be "worthy of awe" for a variety of reasons, which is how we get expressions like "the awful majesty of God."
4. Fizzle: The verb fizzle once referred to the act of producing quiet flatulence (think "SBD"); American college slang flipped the word's meaning to refer to failing at things.
5. Clue: Centuries ago, a clue (or clew) was a ball of yarn. Think about threading your way through a maze and you'll see how we got from yarn to key bits of evidence that help us solve things.
6. Naughty: Long ago, if you were naughty, you had naught or nothing. Then it came to mean evil or immoral, and now you are just badly behaved.
7. Guy: It comes from the name of Guy Fawkes, who was part of a failed attempt to blow up Parliament in 1605. Folks used to burn his effigy, a "Guy Fawkes" or a "guy," and from there it came to refer to a frightful figure. In the U.S., it has come to refer to men in general.

Possible Preaching Angles: Doctrine; Word of God; Theology; Love; Repentance; Marriage, and so forth—You can pick many words in the Christian vocabulary, words about biblical doctrine or a biblical lifestyle, and examine how these words have changed meanings from Scripture to today. Unfortunately, many of these changes in definitions of biblical words aren't just interesting or innocent; they damage our faith and weaken our understanding of Christ.