Thirty white horses on a red hill, First they champ, Then they stamp, Then they stand still. What are they?

Answer: Teeth.

More Riddles for Adults with answers

More Riddles for Adults

What can be swallowed, but can also swallow you?
What can be touched but can't be seen?
What did the hangman get his wife for her birthday?
What fastens two people yet touches only one?
What three letters change a girl into a woman?
What's at least 6 inches long, goes in your mouth, and is more fun if it vibrates?
WYISDERSOMENIMORORSIZASIZDENDERISORSIZ? What does this say?
You have me today, Tomorrow you'll have more; As your time passes, I'm not easy to store; I don't take up space, But I'm only in one place; I am what you saw, But not what you see. What am I?
A certain crime is punishable if attempted but not punishable if committed. What is it?
A headless man had a letter to write; It was read by a man who had lost his sight. The dumb repeated it word for word, And deaf was he who listened and heard. What is it?
A man is discovered dead sitting at his desk, alone in the locked office. He did not commit suicide and there was no weapons in the room. The only clue is a sealed envelope on the desk in front of him. How did he die?
First I am dried, then I am wet; The longer I swim, the more taste you get. What am I?