Meaning

1. To sadden or displease (someone) by underperforming, or by not delivering something promised or hoped for.
2. To deprive (someone of something expected or hoped for).
3. To fail to meet (an expectation); to fail to fulfil (a hope).
4. To show (an opinion, belief, etc.) to be mistaken.
5. (obsolete) To prevent (something planned or attempted).