What does the word prevent mean?

Usage examples for prevent

  1. " Yes, that's true; it will be all right if I can prevent it getting any worse. – Secret Bread by F. Tennyson Jesse
  2. Self- respect, if nothing else, would prevent his even speaking another word to her that night. – Laramie Holds the Range by Frank H. Spearman
  3. I couldn't prevent it, Mr. Krogstad. – A Doll's House by Henrik Ibsen